# Flexitest Precision Material & Packaging Testing Instruments | Mumbai - Site: https://flexitest.in/ ## IS 11652 UV Weathering Test for Cement Sacks - Link: https://flexitest.in/blogs/is-11652-uv-weathering-test-cement-sacks/ - Published: 2026-10-28T12:04:58+05:30 - Author: kamal [Home](https://flexitest.in/)[Blogs](https://flexitest.in/blogs/)IS 11652 UV weathering test BIS compliance for cement sacks # IS 11652 UV Weathering Test for Cement Sacks BIS certification under IS 11652 is mandatory for 50 kg cement sacks from 6 October 2026. See what the UV resistance test requires and how to run it. In this guide 1. [What changed on 6 October 2026](https://flexitest.in/blogs/is-11652-uv-weathering-test-cement-sacks/#is-section-1) 2. [What IS 11652 says about UV resistance](https://flexitest.in/blogs/is-11652-uv-weathering-test-cement-sacks/#is-section-2) 3. [How the UV weathering test is run](https://flexitest.in/blogs/is-11652-uv-weathering-test-cement-sacks/#is-section-3) 4. [Outside lab or your own chamber?](https://flexitest.in/blogs/is-11652-uv-weathering-test-cement-sacks/#is-section-4) 5. [Which accelerated weathering chamber fits a sack plant](https://flexitest.in/blogs/is-11652-uv-weathering-test-cement-sacks/#is-section-5) 6. [Set up your UV test before the next audit](https://flexitest.in/blogs/is-11652-uv-weathering-test-cement-sacks/#is-section-6) 7. [Sources](https://flexitest.in/blogs/is-11652-uv-weathering-test-cement-sacks/#is-section-7) Related machine [⌊UV Chamber ST UVA/UVB⌉⌊UV Chamber ST UVA/UVB⌉[ UV Chamber ST UVA/UVB [View details →](https://flexitest.in/packaging-testing-equipments/accelerated-weathering-chamber-packaging/uv-chamber-st-uva-uvb-packaging/) From 6 October 2026, HDPE and PP woven sacks for 50 kg cement must carry the BIS Standard Mark under IS 11652:2017. The standard includes a UV resistance requirement that many sack plants have never had to prove on paper. This article explains what the clause asks for, how the test is run, and what equipment you need to run it. ## What changed on 6 October 2026 The Quality Control Order for HDPE/PP woven cement sacks came into force on 6 October 2026. The Department of Chemicals and Petrochemicals fixed that date in an amendment order notified on 5 January 2026, after several earlier extensions. In practice this means three things for a sack manufacturer: * Every HDPE/PP woven sack for 50 kg cement that is manufactured, imported or sold in India must conform to IS 11652:2017 and carry the BIS Standard Mark. * To use the mark you need a BIS licence, which means your product must pass every applicable test in the standard. * Two related orders took effect on the same day: IS 16709:2017 for PP laminated block bottom valve cement sacks, and IS 17399:2020 for laminated mail sacks. If you supply cement companies and do not yet hold a licence, testing is the first thing to put in place. ## What IS 11652 says about UV resistance UV-stabilised sack fabric must keep at least 50 percent of its original breaking strength after UV exposure. That is the requirement of clause 5.6, with the test method in Annex F, as BIS-recognised laboratories list it. Polypropylene and HDPE tapes break down in sunlight. A sack that passes a strength test on the day it is stitched can turn brittle after weeks in an open yard, a rail siding or a dealer's godown. When it tears, cement is lost and the cement brand takes the complaint. The UV clause exists to catch that before the sack leaves your plant. Three related points in the standard are worth knowing: * **Ash content.** The limit is 2.2 percent for UV-stabilised sacks and 6 percent for non-UV-stabilised sacks. * **Stitching.** For UV-stabilised sacks, the stitching tape or thread must be UV-stabilised too. * **Scope of the UV test.** The clause applies to UV-stabilised sacks. BIS's testing scheme for IS 11652 sets the test frequency "as agreed to between buyer and the seller". So if your customer orders UV-stabilised sacks, 50 percent retention is the number you are certified against, and you need test reports to prove it. ## How the UV weathering test is run The test compares the fabric's breaking strength before and after a fixed period in an accelerated weathering chamber. 1. **Measure the original strength.** Cut fabric specimens and test breaking strength lengthwise and widthwise on a tensile tester, using the ravelled strip method of IS 1969 (Part 1). 2. **Expose a second set of specimens.** Place them in a UV weathering chamber. BIS- recognised labs list the exposure for IS 11652 as 192 hours, which is eight days of continuous running. 3. **Cycle UV and moisture.** For this family of woven sack standards, labs describe the cycle as 8 hours of UV light at 60 °C followed by 4 hours of dark condensation at 50 °C. The UV step imitates sunlight and the condensation step imitates night- time dew. 4. **Test again and calculate retention.** Break the exposed specimens on the same tensile tester. Retention is the strength after exposure divided by the original strength, times 100. A fabric that breaks at 1,000 N before exposure must still hold at least 500 N afterwards to pass. ## Outside lab or your own chamber? An outside lab works for an occasional test, but it is slow and costly once you test regularly. The exposure alone takes eight days, before courier time and the lab's queue. Your own chamber pays back when any of these apply: * You change the UV masterbatch dose, resin grade, tape denier or supplier, and need to know the effect before a full production run. * You supply more than one cement company, each with its own sack specification. * Your buyers ask for a UV retention report with each lot. * You want to find a weak batch yourself, before a BIS sample or a customer complaint finds it. BIS's testing scheme also expects every licensee to maintain a laboratory that is" suitably equipped and staffed" for the tests in the standard. Ask your BIS branch office which tests it will accept from an outside lab. ## Which accelerated weathering chamber fits a sack plant For the IS 11652 UV test, a fluorescent UV chamber with a condensation cycle is the right instrument. Flexitest supplies two, plus a xenon chamber for plants that also test print and colour. | Model | Light source | Samples per run (150 × 70 mm) | Irradiance | Best for | | UV Chamber ST UVA/UVB | 8 fluorescent lamps of 40 W, UVA-340 or UVB-313 | 48 | 0.3 to 1.55 W/m², settable | Plants running several fabric grades or customers. Black panel temperature control up to 80 °C and a condensation system. | Most cement sack plants should start with the ST chamber. It holds 48 specimens, so lengthwise and widthwise sets from several lots can run in the same eight days. The chamber is half of the test. You also need a universal testing machine to measure breaking strength before and after exposure. [⌊UV Chamber ST UVA/UVB⌉⌊UV Chamber ST UVA/UVB⌉[ Related machine UV Chamber ST UVA/UVB Floor-standing UV weathering chamber for accelerated ageing of packaging films, labels and containers using UVA and UVB lamps. [View details →](https://flexitest.in/packaging-testing-equipments/accelerated-weathering-chamber-packaging/uv-chamber-st-uva-uvb-packaging/) ## Set up your UV test before the next audit IS 11652 is now law for 50 kg cement sacks, and UV retention is one of the results your customers and BIS can ask you to prove. Flexitest supplies the weathering chamber and the tensile tester, with free installation and operator training, and branches in Mumbai, Delhi, Ahmedabad, Vadodara, Pune, Hyderabad and Chennai. Send us your sack specification and your customer's UV requirement, and we will recommend the chamber and lamp type to match. ### Get a quote or a demo today [Get instant quotation](https://flexitest.in/blogs/is-11652-uv-weathering-test-cement-sacks/#elementor-action%3Aaction%3Dpopup%3Aopen%26settings%3DeyJpZCI6Ijk5MzgiLCJ0b2dnbGUiOmZhbHNlfQ%3D%3D) Email: [sales@flexitest.in](https://flexitest.in/blogs/is-11652-uv-weathering-test-cement-sacks/sales@flexitest.in) Phone: [+91 22-4970 6073](https://flexitest.in/blogs/is-11652-uv-weathering-test-cement-sacks/+912249706073) or [+91 93263 25135](https://flexitest.in/blogs/is-11652-uv-weathering-test-cement-sacks/+919326325135) [See all accelerated weathering chambers](https://flexitest.in/packaging-testing-equipments/accelerated-weathering-chamber-packaging/) ## Sources * Gazette notification of 5 January 2026: amendment orders for three types of woven sacks (Department of Chemicals and Petrochemicals) * BIS note on IS 11652:2017 and the Quality Control Order * BIS Scheme of Testing and Inspection for IS 11652:2017, January 2018 * BIS LIMS lab scope: IS 11652 clause 5.6 and ash content limits * BIS LIMS lab scope: test charges for IS 11652 UV exposure * BIS LIMS listing: 192-hour UV conditioning for IS 11652 * BIS LIMS lab scope: 8 h at 60 °C and 4 h at 50 °C cycle for woven sack standards * Corpseed summary of the January 2026 amendment orders * Flexitest product pages: ST UVA/UVB, SB UVA/UVB benchtop, SX/1000 xenon Get Instant Quotation ## Salt Spray Chamber: A Complete Guide to Salt Spray Corrosion Testing - Link: https://flexitest.in/blogs/salt-spray-chamber-guide/ - Published: 2026-10-12T13:48:13+05:30 - Author: kamal ![Salt spray chamber with coated metal panels under corrosive salt fog in a testing laboratory](https://flexitest.in/wp-content/uploads/2026/10/metal-panels-undergoing- corrosion-testing-inside-a-salt-spray-fog-chamber-1024x559.jpg "Salt Spray Chamber: A Complete Guide to Salt Spray Corrosion Testing 3") [Home](https://flexitest.in/)[Blogs](https://flexitest.in/blogs/)Salt spray chamber A practical guide for corrosion testing labs # Salt Spray Chamber: A Complete Guide to Salt Spray Corrosion Testing How a salt spray chamber works, which standards apply, and what to look for before you buy. In this guide 1. [Why corrosion testing matters](https://flexitest.in/blogs/salt-spray-chamber-guide/#salt-section-1) 2. [What is a salt spray test?](https://flexitest.in/blogs/salt-spray-chamber-guide/#salt-section-2) 3. [Salt spray test standards](https://flexitest.in/blogs/salt-spray-chamber-guide/#salt-section-3) 4. [Industries that use salt spray chambers](https://flexitest.in/blogs/salt-spray-chamber-guide/#salt-section-4) 5. [How to choose the right chamber](https://flexitest.in/blogs/salt-spray-chamber-guide/#salt-section-5) 6. [Flexitest 880/T, 881/T and 882/T series](https://flexitest.in/blogs/salt-spray-chamber-guide/#salt-section-6) 7. [Frequently asked questions](https://flexitest.in/blogs/salt-spray-chamber-guide/#salt-section-7) 8. [Get a quote](https://flexitest.in/blogs/salt-spray-chamber-guide/#salt-section-8) A salt spray chamber exposes samples to controlled salt fog to compare their corrosion resistance under specified laboratory conditions. Test hours do not translate directly into years of outdoor service. This guide explains what a salt spray test is, how a salt spray chamber works, which standards apply, which industries use it and what to look for when you buy one. ## Why corrosion testing matters A rusted bolt, a blistered paint finish or a peeling chrome trim costs far more than the part itself. It leads to warranty claims, rejected batches and lost customers. In a country like India, with a long coastline, high humidity and heavy monsoons, corrosion resistance is a basic quality requirement, not an extra. Salt spray testing provides a controlled exposure for comparing samples and checking performance against a specified test duration and evaluation criteria. Predicting outdoor service life requires additional evidence, including relevant long-term exposure data. ## What is a salt spray test and how does the chamber work? A salt spray test (also called a salt fog test) is an accelerated corrosion test. Coated or plated samples are placed in a closed chamber and exposed to a continuous fine mist of salt solution at a controlled temperature. After a set number of hours, the samples are checked for rust, blistering, creep from a scribe line and loss of adhesion. In a typical neutral salt spray (NSS) test to [ASTM B117](https://store.astm.org/b0117-19.html), the chamber runs at 35 °C with a 5% sodium chloride solution at a pH of 6.5 to 7.2. The fog must settle on the samples at 1.0 to 2.0 ml per 80 cm² per hour, measured with collectors placed inside the chamber. A salt spray chamber runs the test in five steps: 1. **Solution supply:** Salt solution is prepared and stored in a reservoir tank. 2. **Air conditioning:** Compressed air passes through a heated, water-filled saturator tower (humidifying tower), so it is warm and fully humid before it reaches the nozzle. 3. **Atomisation:** The nozzle mixes the air and solution into a fine fog that fills the chamber. 4. **Exposure:** Samples sit on racks at a fixed angle, usually 15° to 30° from the vertical, so the fog settles evenly on the test surface. 5. **Evaluation:** After the set hours, samples are removed, rinsed and rated for corrosion against the customer's or standard's acceptance criteria. Variants of the test change the solution or temperature. The acetic acid salt spray( AASS) test lowers the pH with acetic acid. The copper-accelerated acetic acid salt spray (CASS) test adds copper chloride and runs at 50 °C, which makes it much more aggressive and suitable for decorative nickel-chrome plating. ![Steel test panel rusted after a salt spray chamber test, next to a clean panel before the test](https://flexitest.in/wp-content/uploads/2026/10/Salt-Spray-Corrosion- Comparison.webp "Salt Spray Chamber: A Complete Guide to Salt Spray Corrosion Testing 4") Illustration of corrosion before and after salt spray exposure. A laboratory exposure period is not a direct measure of years in outdoor service. ## Salt spray test standards [ASTM B117](https://store.astm.org/b0117-19.html) and [ISO 9227](https://www.iso.org/standard/63543.html) are the two standards most often written into customer specifications. The table lists the main standards a modern salt spray chamber should support. | Standard | What it covers | Typical users | | ASTM B117 | Operating salt spray (fog) apparatus; the base NSS method | All industries | | ISO 9227 | Salt spray tests in artificial atmospheres: NSS, AASS and CASS | All industries, export suppliers | | ISO 7253 | Neutral salt spray resistance of paints and varnishes | Paint and coating manufacturers | | ASTM B368 | Copper-accelerated acetic acid salt spray (CASS) | Decorative chrome and nickel plating | | ASTM B380 | Corrodkote procedure for decorative electroplated coatings | Electroplaters, automotive trims | | ASTM G85 | Modified salt spray, including cyclic and acidified tests | Automotive and aerospace | | ASTM D1735 | Water resistance of coatings using a water fog | Coating and plastics labs | | ISO 4611 | Effects of damp heat, water spray and salt mist on plastics | Plastic and polymer processors | | DIN 50021 | German salt spray test method (now largely replaced by ISO 9227) | Suppliers to German OEMs | The customer specification normally names the standard, the test type and the number of hours. Check it before you set up a test, because a chamber that only meets ASTM B117 cannot run a CASS or water fog test. ## Industries that use salt spray chambers ### Paint and coating Paint makers, powder coaters and electroplaters use salt spray testing to compare formulations and assess samples against agreed corrosion-test criteria. Testers scribe a line through the paint film and measure how far corrosion creeps underneath it. Primers are often tested for 96 to 240 hours, while industrial paint systems can run 500 to 1,000 hours or more. Read more: [salt spray chamber for paint and coating](https://flexitest.in/paint-coating-metals/salt-spray-chamber-for-paint-coating/), or see our [paint, coating and metals testing](https://flexitest.in/paint-coating-metals/) range. [⌊Flexitest 880/T programmable salt spray chamber for paint and coating testing⌉⌊ Flexitest 880/T programmable salt spray chamber for paint and coating testing⌉[ Salt spray chamber for paint & coating Flexitest 880/T Programmable Salt Spray Chamber Programmable salt spray chamber for corrosion testing of paints, coatings and metal finishes to ASTM B117 and ISO 9227. [View salt spray chamber details →](https://flexitest.in/paint-coating-metals/salt-spray-chamber-for-paint-coating/) ### Automotive Vehicles face road salt, coastal air and monsoon splash, so OEMs ask for salt spray reports on fasteners, brake parts, chassis components, body panels and chrome trims. Plain zinc-plated fasteners may be specified at 72 to 96 hours, while zinc-nickel and zinc-flake coatings often need 720 hours or more. CASS testing is common for decorative plating, and cyclic tests based on ASTM G85 are growing. Read more: [salt spray chamber for automotive parts](https://flexitest.in/automotive/salt-spray-chamber-for-automotive/), or see our [automotive component testing](https://flexitest.in/automotive/) range. [⌊Flexitest 880/T programmable salt spray chamber for automotive parts testing⌉⌊ Flexitest 880/T programmable salt spray chamber for automotive parts testing⌉[ Salt spray chamber for automotive parts Flexitest 880/T Programmable Salt Spray Chamber Programmable salt spray chamber for fasteners, plated parts, body panels and chrome trims, with NSS, CASS and ASTM G85 test support. [View salt spray chamber details →](https://flexitest.in/automotive/salt-spray-chamber-for-automotive/) ### Plastic and polymer Plastics do not rust, but chrome-plated plastic trims blister, painted housings lose adhesion and metal inserts corrode inside moulded parts. ISO 4611 sets out how to expose plastics to damp heat, water spray and salt mist, and ASTM D1735 covers water fog testing of coatings. Read more: [salt spray chamber for plastics and polymers](https://flexitest.in/plastic-and-polymer/salt-spray-chamber-for-plastics/), or see our [plastic and polymer testing](https://flexitest.in/plastic-and-polymer/) range. [⌊Flexitest 880/T programmable salt spray chamber for plastic and polymer testing⌉⌊ Flexitest 880/T programmable salt spray chamber for plastic and polymer testing⌉[ Salt spray chamber for plastics & polymers Flexitest 880/T Programmable Salt Spray Chamber Programmable salt spray chamber for chrome-plated plastic trims, painted housings and moulded parts, with ISO 4611 and ASTM D1735 support. [View salt spray chamber details →](https://flexitest.in/plastic-and-polymer/salt-spray-chamber-for-plastics/) Other users include electrical and electronics makers (enclosures, connectors), fastener manufacturers, hardware and sanitaryware brands, solar mounting structure suppliers and marine equipment makers. ![Salt spray test chambers running damp heat, water spray and salt mist tests on metal and plastic samples](https://flexitest.in/wp-content/uploads/2026/10/Damp- Heat-Water-Salt-Mist-Exposure.webp "Salt Spray Chamber: A Complete Guide to Salt Spray Corrosion Testing 8") Damp heat, water spray and salt mist exposure on metal, aluminium and plastic composite samples. ## How to choose the right salt spray chamber The right chamber depends on the standards you test to, the size of your parts and how long your tests run. Check these points before you buy: * **Standards supported:** Make sure it can run every test your customers ask for: NSS, AASS, CASS and water fog, not just ASTM B117. * **Chamber material:** Salt and acid fog attack metal parts and cheap plastics. Titanium or high-grade FRP interiors last longest. * **Temperature control:** Look for PID control, uniformity of ±2 °C or better and enough range for CASS (50 °C working room, about 63 °C saturator). * **Spray system:** Siphon nozzles can clog with salt crystals on long runs. A pump-fed system gives a steadier fog fall-out rate. * **Sample racks and load:** Racks should hold panels at the correct angle and also take bulky or heavy parts. * **Programming and data:** A programmable controller with data logging and export saves operator time and gives you records for audits. * **Size:** Choose a working volume that fits your largest part and a typical batch, with space left for fog to circulate. * **Local service:** [Calibration](https://flexitest.in/services/calibration/), spares and quick support matter as much as the purchase price. ## The Flexitest 880/T, 881/T and 882/T series Flexitest's programmable [salt spray chambers](https://flexitest.in/paint-coating-metals/salt-spray-chamber-for-paint-coating/) are built around these points: * **Chamber build:** Titanium inner chamber with a painted steel outer body, silicone gasket seal and air-cylinder operated lid. * **Heating:** PID air heating from the chamber walls, so the solution's concentration and pH are not affected. Working room RT+5 °C to 55 °C, saturator tower RT+5  °C to 65 °C, uniformity ≤ ±2 °C and stability ≤ ±0.5 °C. * **Spray system:** Peristaltic pump spray system fed from a large external tank, with adjustable flow and no siphon-nozzle crystallisation. * **Sample rack:** Three-level rack with corrosion-resistant rods, V-shaped glass- fibre brackets at 20° ± 5° and a mesh plate, rated above 200 kg. * **Controller:** TEMI 880 7-inch touch-screen controller with program, fixed-value and timed start/stop modes. Continuous fog up to 999.9 hours; interval fog up to 99 h 59 min spray and 99 h 59 min pause. * **Data and networking:** Data logging for up to 360 days at a 2-minute interval, USB program transfer and RS232 networking for up to 16 chambers. * **Safe design:** Inclined cover that keeps condensate from dripping on samples, and fully separated water and electrical sections. * **Standards:** ASTM B117, ASTM B368, ASTM B380, ASTM G85, ASTM D1735, ISO 9227, ISO 7253, ISO 4611 and DIN 50021. ## Frequently asked questions ### How many hours of salt spray testing equal one year outdoors? There is no fixed conversion. Real-world corrosion depends on climate, pollution and how the part is used, so salt spray hours are best used to compare coatings and check them against a specification, not to predict exact service life. ### What is the difference between NSS, AASS and CASS tests? NSS uses a neutral 5% salt solution at 35 °C. AASS adds acetic acid to lower the pH. CASS adds acetic acid and copper chloride and runs at 50 °C, making it the most aggressive of the three. ### What salt solution is used in a salt spray test? ASTM B117 and ISO 9227 use a 5% sodium chloride solution made with high-purity salt and distilled or deionised water, with the pH adjusted to the range the standard sets. ### How often should a salt spray chamber be calibrated? Most labs calibrate temperature sensors and check fog collection at least once a year, and verify collection rates during every test as the standards require. Your quality system or accreditation body may ask for more frequent checks. ### Can one chamber run both salt spray and water fog tests? Yes, if the chamber supports it. The Flexitest 880/T series runs salt spray, CASS and ASTM D1735 water fog tests in the same cabinet. ## Get a quote for your salt spray chamber Flexitest supplies programmable salt spray chambers to paint, automotive, plastics and manufacturing companies across India. Tell us your standards, sample sizes and test hours, and our team will recommend the right model. ### Get a quote or a demo today Tell us your standards, sample sizes and test hours, and our team will recommend the right model. [Get instant quotation](https://flexitest.in/blogs/salt-spray-chamber-guide/#elementor-action%3Aaction%3Dpopup%3Aopen%26settings%3DeyJpZCI6Ijk5MzgiLCJ0b2dnbGUiOmZhbHNlfQ%3D%3D) Or call [+91 93263 25135](https://flexitest.in/blogs/salt-spray-chamber-guide/+919326325135)· [sales@flexitest.in](https://flexitest.in/blogs/salt-spray-chamber-guide/sales@flexitest.in) Flexitest, SF-A-13, 2nd Floor, Art Guild House, Phoenix Market City, LBS Road, Kurla( W), Mumbai 400070 Get Instant Quotation ## HDPE & PP Woven Sack Testing: BIS Requirements and Choosing the Right UTM - Link: https://flexitest.in/blogs/hdpe-pp-woven-sack-testing-bis-utm-selection/ - Published: 2026-10-08T09:07:09+05:30 - Author: kamal ![Close-up of woven-sack material (illustration)](https://flexitest.in/wp-content/ uploads/2026/10/woven-sack-creative-hero.webp "HDPE & PP Woven Sack Testing: BIS Requirements and Choosing the Right UTM 9") FLEXITEST JOURNAL APPLICATION GUIDE # HDPE & PP Woven Sack Testing: BIS Requirements and Choosing the Right UTM From fabric and seams to actual breaking force-build your testing capability around the sacks you make. [Compare 5ST and 25ST ](https://flexitest.in/blogs/hdpe-pp-woven-sack-testing-bis-utm-selection/#ft-comparison) [Discuss Woven-Sack Testing](https://flexitest.in/blogs/hdpe-pp-woven-sack-testing-bis-utm-selection/#elementor-action%3Aaction%3Dpopup%3Aopen%26settings%3DeyJpZCI6Ijk5MzgiLCJ0b2dnbGUiOmZhbHNlfQ%3D%3D) Woven material · Editorial illustration QCO COMMENCEMENT**06 OCT 2026** The notified commencement date of **6 October 2026** has now arrived for three woven- sack Quality Control Orders. The [Gazette amendments dated 5 January 2026](https://www.bis.gov.in/wp-content/uploads/2026/01/Textiles-Polypropylene-PP-Woven-Laminated-Block-Bottom-Valve-Sacks-for-Packaging-50-kg-Cement-Quality-Control-Amendment-Order-2026.pdf) set that date for the categories below, making this a timely point to review your laboratory's methods and equipment. Inside this guide 1. [BIS requirements](https://flexitest.in/blogs/hdpe-pp-woven-sack-testing-bis-utm-selection/#ft-bis) 2. [Fabric & seam testing](https://flexitest.in/blogs/hdpe-pp-woven-sack-testing-bis-utm-selection/#ft-method) 3. [Choosing the force range](https://flexitest.in/blogs/hdpe-pp-woven-sack-testing-bis-utm-selection/#ft-strength) 4. [5ST / 25ST comparison](https://flexitest.in/blogs/hdpe-pp-woven-sack-testing-bis-utm-selection/#ft-comparison) 5. [Explore the machines](https://flexitest.in/blogs/hdpe-pp-woven-sack-testing-bis-utm-selection/#ft-products) 6. [Discuss your application](https://flexitest.in/blogs/hdpe-pp-woven-sack-testing-bis-utm-selection/#ft-enquiry) [Technical Textile UTMs ↗](https://flexitest.in/technical-textiles/textile-utm/) A woven sack can look right-and still fail where it matters. For HDPE (high-density polyethylene) and PP (polypropylene) woven sacks, tensile testing helps assess fabric breaking strength, elongation at break and, where required by the method, seam or closure strength. Its fabric may perform well while a seam becomes the weak point. Another batch may withstand a similar force but stretch differently before failure. For a quality team, these differences are a reason to look beyond appearance and understand the specimen. ## Which BIS standard applies to your woven sacks? This guide focuses on the three sack categories covered by the January 2026 amendment notice linked above. The table is not a complete list of standards for all woven sacks. Woven-sack categories and their corresponding Indian standards| Indian standard | Product category | | IS 11652:2017 | HDPE/PP woven sacks for packaging of 50 kg cement | | IS 16709:2017 | PP woven, laminated, block bottom valve sacks for packaging of 50 kg cement | | IS 17399:2020 | PP/HDPE laminated woven sacks for mail sorting, storage, transport and distribution | The [original orders](https://bis.gov.in/wp-content/uploads/2023/12/Polyethylene-woven-Sacks-QCO.pdf) require covered goods to conform to the corresponding Indian standard and bear the Standard Mark under a BIS Scheme-I licence; goods meant for export are excluded. Check the current order and amendments for your product's applicability. The construction and intended use of the sack determine the relevant standard. Stitched cement sacks, block-bottom valve sacks and mail-handling sacks require their own assessment. Establish applicability from the current standard, its amendments and the relevant certification provisions before setting up a test programme. Read the specimen ## Fabric strength, elongation and seam testing For HDPE/PP cement sacks covered by **BIS IS 11652**, the [BIS product manual](https://bis.gov.in/wp-content/uploads/2021/05/PM11652-may.pdf) references **IS 1969 (Part 1)** for fabric breaking strength and elongation, and** IS 9030** for seam strength. Where customers specify ASTM testing, [ASTM D5035](https://store.astm.org/standards/d5035) covers strip tests, [ASTM D5034](https://store.astm.org/standards/d5034) covers grab tests, and [ASTM D1683/D1683M](https://store.astm.org/d1683_d1683m-22.html) covers sewn seams in woven fabrics. ASTM D5035 and D5034 are not recommended for fabrics with elongation above 11%. Confirm specimen behaviour and the specified method before selecting the load cell, grips and settings. ASTM methods are not interchangeable routes to BIS compliance; sewn-seam methods do not cover every valve or closure. Use the current applicable standards and amendments. 01 ### Fabric breaking strength A tensile test measures the force a prepared fabric specimen withstands during loading. Test the prescribed directions separately to examine performance across the woven structure. Results linked to the batch, direction and method make production changes easier to identify and investigate. 02 ### Elongation at break Breaking force describes only part of the response. Elongation shows how much the specimen extends before failure. Two specimens can withstand similar maximum forces while extending differently; recording both gives the quality team a fuller basis for comparison. 03 ### Seam and closure strength A fabric test cannot establish the strength of a stitched seam or welded joint. If fabric results remain stable while seam results fall, investigate the closure process, specimen preparation and observed failure location. Assess the closure using the applicable method rather than assuming that fabric strength represents the finished sack. Illustrative specimen schematics; follow the applicable preparation and test method. ## Is a 1 kN tensile tester enough for woven-sack testing? Understand the force range ### A minimum requirement is a starting point. It does not tell you the strongest specimen you will need to measure. **900 N**Listing minimum average* **1,000 N**1 kN system capacity **1,150 N**Illustrative specimen break 0 NCommon scale · 1,250 N *900 N is the scoped BIS laboratory-listing example described below. The 1,150 N specimen is hypothetical; neither is a universal selection rule. A [BIS laboratory scope listing for IS 11652:2017](https://lims.bis.gov.in/home_lab_scope/1753/?page=2) gives an example of **900 N minimum average fabric breaking strength in both directions**, using the ravelled-strip method with reference to IS 1969 (Part 1). The current amended standard controls the acceptance requirement and test parameters. **Minimum breaking-strength requirements do not establish the maximum force of actual specimens.** Select the complete test system for the expected range of actual breaking forces, including stronger production samples and an appropriate operating margin. The sack's 50 kg filling capacity also does not determine the required load cell. The tensile tester evaluates a prescribed specimen. Use representative test records, supplier data or preliminary testing to establish the force envelope. Build a dependable method ## Grips, specimens and load cells: four setup decisions 01 ### Grips suited to the specimen For flat woven fabric and prepared seam specimens, begin with the method's clamping requirements. Tinius Olsen lists the HT45 pneumatic grip for flat, flexible textiles; suitability still depends on specimen dimensions, force and the test method. Grip width, contact surface, clamping pressure and alignment influence how securely a specimen is held. Slippage or premature damage near the jaws can compromise a result. Review the failure location and the method's validity rules before treating an unusual reading as a material defect. 02 ### Consistent specimen preparation Dimensions, cutting direction and seam placement must follow the applicable method. Preserve sample identification so every result can be traced to its batch and orientation. Consistency is essential when comparing operators, shifts or laboratories. 03 ### Controlled test conditions Define conditioning, initial grip separation and test speed in the procedure. Results obtained under different conditions may not be directly comparable. Saved software methods support consistent settings alongside operator training and routine checks. Confirm the required speed at the intended force and allow adequate travel for the grips, gauge length and expected extension. 04 ### The appropriate load cell Frame capacity and load-cell measurement range are separate decisions. A higher- capacity frame can use different load cells. Select a load cell that measures expected forces within its verified working range, and check the ratings of all grips, adapters and fixtures. Published force accuracy does not replace calibration evidence for the supplied load cell. ## Tinius Olsen 5ST and 25ST: specification comparison These standard-height models offer different frame capacities. Match the selected load cell, grips, travel and software to the woven-sack application; confirm exactly what the quotation includes. Published OEM specifications for standard 5ST and 25ST models| Specification | Tinius Olsen 5ST | Tinius Olsen 25ST | | Frame capacity | 5 kN | 25 kN | | Available load cells | 5, 10, 25, 50, 100, 250, 500 N; 1, 2.5 and 5 kN | 25, 50, 100, 250, 500 N; 1, 2.5, 5, 10 and 25 kN | | Published force accuracy | 0.2% of applied force across the specified load-cell range; calibration specification separately states ±0.5% to ISO 7500-1 / ASTM E4. | 0.2% of applied force across the specified load-cell range; calibration specification separately states ±0.5% to ISO 7500-1 / ASTM E4. | | Measurement range | 0.2–100% of load-cell capacity; 10 N cell: 0.5–100%; 5 N cell: 1–100%. | 0.2–100% of load-cell capacity. | | Test speed | 0.0001–1,000 mm/min to 2 kN; 0.0001–500 mm/min to 5 kN. | 0.0001–1,000 mm/min to 10 kN; 0.0001–500 mm/min to 25 kN. | | Travel / clearance | 755 mm maximum crosshead travel | 1,090 mm maximum crosshead travel; 410 mm column clearance | | Specimens and grips | Pneumatic, roller, bollard and other grip options. Examples: HT45 for flat flexible textiles; HT57 for cords/fibres. Select to specimen dimensions and force. | Pneumatic, wedge, roller and bollard options; HT43 listed for webbing/strapping and HT45 for textiles. Grip ratings can limit the complete system below 25 kN. | | Software and controls | Horizon data-analysis software; tethered, Bluetooth or virtual controller options. Confirm the supplied package. | Horizon software; tethered, Bluetooth or virtual controller options. Confirm the supplied package. | | Utilities | 115/230 V, 50/60 Hz; 530 W ±10%. Pneumatic grips require external air; frame distribution rated to 100 psi maximum. | 115/230 V, 50/60 Hz; 530 W ±10%. Pneumatic grips require external air; frame distribution rated to 100 psi maximum. | Tinius Olsen 5ST Frame capacity5 kNAvailable load cells5, 10, 25, 50, 100, 250, 500 N; 1, 2.5 and 5 kNPublished force accuracy0.2% of applied force across the specified load-cell range; calibration specification separately states ±0.5% to ISO 7500-1 / ASTM E4. Measurement range0.2–100% of load-cell capacity; 10 N cell: 0.5–100%; 5 N cell: 1–100%.Test speed0.0001–1,000 mm/min to 2 kN; 0.0001–500 mm/min to 5 kN.Travel / clearance755 mm maximum crosshead travelSpecimens and gripsPneumatic, roller, bollard and other grip options. Examples: HT45 for flat flexible textiles; HT57 for cords/ fibres. Select to specimen dimensions and force.Software and controlsHorizon data- analysis software; tethered, Bluetooth or virtual controller options. Confirm the supplied package.Utilities115/230 V, 50/60 Hz; 530 W ±10%. Pneumatic grips require external air; frame distribution rated to 100 psi maximum. Tinius Olsen 25ST Frame capacity25 kNAvailable load cells25, 50, 100, 250, 500 N; 1, 2.5, 5, 10 and 25 kNPublished force accuracy0.2% of applied force across the specified load-cell range; calibration specification separately states ±0.5% to ISO 7500-1 / ASTM E4. Measurement range0.2–100% of load-cell capacity.Test speed0.0001–1,000 mm/min to 10 kN; 0.0001–500 mm/min to 25 kN.Travel / clearance1,090 mm maximum crosshead travel; 410 mm column clearanceSpecimens and gripsPneumatic, wedge, roller and bollard options; HT43 listed for webbing/strapping and HT45 for textiles. Grip ratings can limit the complete system below 25 kN.Software and controlsHorizon software; tethered, Bluetooth or virtual controller options. Confirm the supplied package.Utilities115/ 230 V, 50/60 Hz; 530 W ±10%. Pneumatic grips require external air; frame distribution rated to 100 psi maximum. Configuration and specification notes **Configuration matters.** These figures cover standard-height models in the cited OEM brochures. The quotation defines the supplied load cell, grips, software and calibration scope. Grip ratings can limit the complete system; published force accuracy and calibration specifications are distinct. The 100 psi figure is the maximum frame air-distribution rating, not a universal grip operating pressure. ### Match the system to your sacks Start with your sack type, applicable standard and any available test results. [Discuss Woven-Sack Testing](https://flexitest.in/blogs/hdpe-pp-woven-sack-testing-bis-utm-selection/#elementor-action%3Aaction%3Dpopup%3Aopen%26settings%3DeyJpZCI6Ijk5MzgiLCJ0b2dnbGUiOmZhbHNlfQ%3D%3D) ## Configure the system around your application ![Tinius Olsen 5ST testing machine](https://flexitest.in/wp-content/uploads/2025/ 09/UTM_5st.webp "HDPE & PP Woven Sack Testing: BIS Requirements and Choosing the Right UTM 10") Standard-height, single-column frame ### Tinius Olsen 5ST **5**kN frame capacity A compact 5 kN frame to evaluate for dedicated woven-sack fabric and seam testing, with load cells and grips matched to actual specimen forces. [View Product](https://flexitest.in/universal-tensile-testing-machine/) [Request a Quote](https://flexitest.in/blogs/hdpe-pp-woven-sack-testing-bis-utm-selection/#elementor-action%3Aaction%3Dpopup%3Aopen%26settings%3DeyJpZCI6Ijk5MzgiLCJ0b2dnbGUiOmZhbHNlfQ%3D%3D) ![Tinius Olsen 25ST testing machine](https://flexitest.in/wp-content/uploads/2025/ 09/UTM_25st.webp "HDPE & PP Woven Sack Testing: BIS Requirements and Choosing the Right UTM 11") Standard-height, twin-column frame ### Tinius Olsen 25ST **25**kN frame capacity A 25 kN twin-column frame to evaluate for a broader central laboratory, alongside woven-sack testing with the appropriate load cells and fixtures. [View Product](https://flexitest.in/technical-textiles/textile-utm/utm-25st-25kn-universal-testing-machine-textile/) [Request a Quote](https://flexitest.in/blogs/hdpe-pp-woven-sack-testing-bis-utm-selection/#elementor-action%3Aaction%3Dpopup%3Aopen%26settings%3DeyJpZCI6Ijk5MzgiLCJ0b2dnbGUiOmZhbHNlfQ%3D%3D) ### Choosing between the two For dedicated woven-fabric and seam testing, evaluate the 5ST against actual specimen forces and fixture requirements. For higher-force specimens or a broader laboratory programme, evaluate the 25ST. Where applications span different force ranges, review the load-cell options. Neither a 5 kN nor a 25 kN frame is automatically mandated by a woven-sack standard. The configuration follows the application. ## Tensile testing within your quality programme A UTM evaluates prepared specimens and is one part of the laboratory's quality programme. Map the applicable sack requirements to their methods, sample preparation and testing arrangements; purchasing a machine alone does not establish finished-sack compliance. ## Discuss your woven-sack testing application with Flexitest Whether you are establishing a laboratory or reviewing an existing tensile tester, start with your **sack type, applicable standard and any available test results**. These give Flexitest a basis for discussing the frame, load cell, grips and method setup. If available, specimen dimensions, daily testing volume and existing test settings help refine the configuration. A representative sample trial can help resolve uncertain gripping or force requirements. ### Match your UTM to your test Request a configuration for your HDPE or PP woven-sack laboratory. [Request a UTM Quote](https://flexitest.in/blogs/hdpe-pp-woven-sack-testing-bis-utm-selection/#elementor-action%3Aaction%3Dpopup%3Aopen%26settings%3DeyJpZCI6Ijk5MzgiLCJ0b2dnbGUiOmZhbHNlfQ%3D%3D) Email: [sales@flexitest.in](https://flexitest.in/blogs/hdpe-pp-woven-sack-testing-bis-utm-selection/sales@flexitest.in)· Call: [+91 93263 25135](https://flexitest.in/blogs/hdpe-pp-woven-sack-testing-bis-utm-selection/+919326325135) Explore the [Technical Textile UTM section](https://flexitest.in/technical-textiles/textile-utm/) or read the [complete UTM selection guide](https://flexitest.in/blogs/universal-testing-machine-utm-the-complete-guide-to-material-testing-across-industries/). FLEXITEST Woven-sack testing equipment and application support #### Download the Tinius Olsen 5ST Brochure Name Email Phone Number Company Name Company Location By clicking the button, I agree and consent to the company’s [Privacy Policy](https://flexitest.in/privacy-policy) #### Download the Tinius Olsen 25ST Brochure Name Email Phone Number Company Name Company Location By clicking the button, I agree and consent to the company’s [Privacy Policy](https://flexitest.in/privacy-policy) Request a UTM Quote ## Air Permeability Tester for Technical Textiles: A Complete Guide to the FX 3300 LabAir IV - Link: https://flexitest.in/blogs/air-permeability-tester-fx-3300-labair-iv-guide/ - Published: 2026-09-30T15:01:05+05:30 - Author: kamal ![Air permeability test station clamping a fabric sample](https://flexitest.in/wp- content/uploads/2026/08/Air-Permeability-Test-station-1.webp "Air Permeability Tester for Technical Textiles: A Complete Guide to the FX 3300 LabAir IV 12") [Home](https://flexitest.in/)[Blogs](https://flexitest.in/blogs/)Air permeability A practical guide for technical textile labs # Air Permeability Tester for Technical Textiles: A Complete Guide to the FX 3300 LabAir IV The one number behind airbags that inflate correctly, filters that trap dust, and sportswear that breathes. In this guide 1. [What is air permeability?](https://flexitest.in/blogs/air-permeability-tester-fx-3300-labair-iv-guide/#air-section-1) 2. [Why it matters in technical textiles](https://flexitest.in/blogs/air-permeability-tester-fx-3300-labair-iv-guide/#air-section-2) 3. [How is air permeability tested?](https://flexitest.in/blogs/air-permeability-tester-fx-3300-labair-iv-guide/#air-section-3) 4. [Common units and how they convert](https://flexitest.in/blogs/air-permeability-tester-fx-3300-labair-iv-guide/#air-section-4) 5. [Meet the FX 3300 LabAir IV](https://flexitest.in/blogs/air-permeability-tester-fx-3300-labair-iv-guide/#air-section-5) 6. [Test standards it complies with](https://flexitest.in/blogs/air-permeability-tester-fx-3300-labair-iv-guide/#air-section-6) 7. [How to choose a tester](https://flexitest.in/blogs/air-permeability-tester-fx-3300-labair-iv-guide/#air-section-7) 8. [Why buy through Flexitest?](https://flexitest.in/blogs/air-permeability-tester-fx-3300-labair-iv-guide/#air-section-8) 9. [Frequently asked questions](https://flexitest.in/blogs/air-permeability-tester-fx-3300-labair-iv-guide/#air-section-9) An air permeability tester measures how easily air passes through a fabric. It sounds simple, yet this one number decides whether an airbag inflates correctly, a filter traps dust, or a sportswear fabric feels cool on the skin. In this guide we start from the very basics. You will learn what air permeability means, why technical textile makers care about it, how it is tested, and what to look for in a tester. Then we look closely at the FX 3300 LabAir IV from [Textest Instruments](https://www.textest.ch/), available in India through Flexitest. ## What is air permeability? Air permeability is the rate at which air flows through a material when there is a small difference in air pressure between its two sides. Think of blowing through a handkerchief and then through a raincoat. Air rushes through the handkerchief but hardly moves through the raincoat. The handkerchief has high air permeability; the raincoat has low air permeability. A fabric is made of yarns and fibres with tiny gaps between them. The size, number and shape of these gaps decide how much air gets through. Things that change the gaps include: * **Weave or knit structure:** a tight plain weave lets less air through than an open knit. * **Yarn and fibre type:** fine, tightly twisted yarns pack closer together. * **Fabric thickness and density (GSM):** heavier, denser fabrics usually block more air. * **Finishes and coatings:** calendering, lamination or coatings can close the gaps almost completely. Because our eyes cannot measure these tiny gaps, laboratories use an air permeability tester to put an exact number on them. ## Why air permeability matters in technical textiles Technical textiles are fabrics made for performance rather than looks. In these products, air permeability is often a safety or quality requirement, not a nice- to-have. Here is where it shows up: | Application | Why air permeability matters | | Automotive airbags | The fabric must hold gas long enough to cushion the passenger, then release it in a controlled way. | | Filtration media (air, dust, HVAC) | Air must pass freely while particles are trapped. Too low means high energy use; too high means poor filtering. | | Nonwovens (medical, hygiene, geotextiles) | Breathability of masks, gowns and diapers depends on it. | | Sportswear and protective clothing | Controls breathability and comfort, or wind resistance in outerwear. | | Parachutes and sailcloth | Decides how the canopy or sail fills and holds its shape. | | Paper and packaging | Porosity affects printing, filtering and packaging performance. | | Foams (seating, bedding) | Air flow affects comfort and heat build-up. | For manufacturers, testing air permeability helps to: * Check incoming raw material against the supplier's specification. * Keep production consistent from batch to batch. * Meet buyer and export requirements that quote ASTM, ISO or JIS standards. * Develop new products, such as a lighter fabric with the same wind resistance. India's technical textile sector is growing fast, and export buyers increasingly ask for test reports to international standards. A reliable in-house tester saves time and outside lab fees. ## How is air permeability tested? Every air permeability tester follows the same basic idea: hold the fabric firmly, pull air through it at a fixed pressure difference, and measure how much air flows. 1. **Clamp the sample.** A piece of fabric is clamped over a round opening of known area, called the test surface (for example 20 cm²). 2. **Create a pressure difference.** A vacuum pump draws air through the fabric until the pressure drop across it reaches the value the standard asks for. For many fabric standards this is 100 Pa or 125 Pa. 3. **Measure the air flow.** The instrument measures the volume of air passing through each second. 4. **Calculate the result.** Air flow is divided by the test area, giving air permeability as a velocity. In simple terms: **air permeability = volume of air flowing per second ÷ test area**. Testing several spots on the same fabric and averaging them gives a more reliable result, because fabrics are rarely perfectly even. ## Common units, and how they convert Different countries and industries use different units, which often confuses new users. The good news is that they all describe the same thing. | Unit | Where it is common | 1 mm/s equals | | mm/s | ISO and European standards | 1 | | l/m²/s | Same as mm/s, used interchangeably | 1 | | cm³/cm²/s | ASTM D737, older lab reports | 0.1 | | ft³/ft²/min (CFM) | US buyers, airbag and filter industry | 0.197 | | l/dm²/min | Some European and paper standards | 0.6 | | m³/m²/min | Filtration and industrial fabrics | 0.06 | | m³/m²/h | HVAC and building materials | 3.6 | A good tester displays the result in whichever unit your customer asks for, so no manual conversion is needed. ## Meet the FX 3300 LabAir IV air permeability tester The [FX 3300 LabAir IV](https://flexitest.in/technical-textiles/air-permeability-technical-textile/fx3300-lab-air-permeability-tester-textile/) is the fourth generation of Textest's well-known [FX 3300 series](https://www.textest.ch/en/products/fx-3300-labair-iv). It brings 50 years of experience and R&D into one instrument for measuring both air permeability and pressure drop. It stands out for being easy to use, flexible, and able to handle a very wide measuring range, from dense coated fabrics to open nonwovens. ### Key features in plain language * **Sophisticated design:** a compact test head and touchscreen unit mounted on a mobile trolley, so it fits neatly into a QC lab. * **More than air permeability:** it also measures pressure drop, useful for filter media and other flow-resistance testing. * **Sequence Module:** lets operators run a series of tests in a set order, which speeds up routine QC. * **Automatic cleaning function:** uses compressed air to keep the instrument clean. Compressed air is optional; the tester works without it. * **Automatic measuring range selection:** the instrument picks the right range by itself, so the operator does not need to guess the fabric's permeability in advance. * **Evaluation and printing options:** results can be evaluated on the instrument and printed for reports and customer certificates. ### Technical specifications | Parameter | FX 3300 LabAir IV | | Measuring range (air permeability) | 0.4 to 750 cm³/cm²/s at 5 cm²; 1 to 10,000 mm/s (l/m²/s) at 20 cm² | | Units | mm/s, l/m²/s, l/dm²/min, ft³/ft²/min, cm³/cm²/s, m³/m²/min, m³/m²/h | | Measurement accuracy | Better than ±3% of displayed value | | Test pressure | 20 to 2,500 Pa (can be increased to 5,000 Pa) | | Test surfaces | 5, 20, 25, 38 and 100 cm² (others on request) | | User interface | Touchscreen | | Power supply | 195 to 260 VAC, 50/60 Hz, max. 1,100 W; or 85 to 130 VAC, 50/60 Hz, max. 1,100 W | | Compressed air | 5 to 8 bar, only needed for the cleaning function | ### What these numbers mean for you * **Wide range:** from 1 to 10,000 mm/s covers almost everything from airbag fabric to highly open nonwovens on one machine. * **Five test areas:** choose a small head for narrow samples or a large 100 cm ² head for uneven fabrics like nonwovens, where a bigger area gives a more representative result. * **Flexible pressure:** 20 to 2,500 Pa (up to 5,000 Pa) means you can follow different standards without changing instruments. * **±3% accuracy:** consistent results that hold up in buyer audits and supplier disputes. ## Test standards the LabAir IV complies with A test standard is an agreed recipe for doing a test, so results from different labs can be compared. The FX 3300 LabAir IV complies with the standards below and many other national and international methods. | Standard | Region / body | Typical material | | ASTM D737 | USA | Textile fabrics | | ASTM D3574 | USA | Flexible foams | | DIN 53887 | Germany | Textile fabrics | | EN ISO 9237 | International / Europe | Textile fabrics | | EN ISO 7231 | International / Europe | Flexible cellular polymers (foams) | | GB/T 5453 | China | Textile fabrics | | GB/T 24218.15 | China | Nonwovens | | JIS L 1096-A | Japan | Woven and knitted fabrics | | TAPPI T-251 | Paper industry | Porous paper and fabrics | | WSP 70.1 | Nonwovens industry (EDANA / INDA) | Nonwovens | If you export to the US, buyers will usually quote [ASTM D737](https://www.astm.org/d0737-18.html). European buyers typically ask for [ISO 9237](https://www.iso.org/standard/16869.html). Having one instrument that covers both saves you from maintaining two setups. ## How to choose an air permeability tester: a quick checklist Before buying any air permeability tester, check these points against your needs: * Does it cover the standards your buyers ask for? * Is the measuring range wide enough for all your fabrics, from dense to open? * Does it offer several test areas for different sample sizes? * Can it display results in the units your customers use? * Is it easy for operators to use, ideally with automatic range selection? * Is local service, calibration and training available? The LabAir IV ticks the instrument-side boxes on this list. For the last point, buying through a local partner matters. You can see the full range on our [air permeability testers](https://flexitest.in/technical-textiles/air-permeability-technical-textile/) page. ## Why buy through Flexitest? Flexitest supplies material testing instruments to Indian industry from its branch offices located across India. When you buy the FX 3300 LabAir IV through Flexitest, you get: * Help choosing the right test heads and accessories for your products * Installation and operator training at your site * Local support for service and [calibration](https://flexitest.in/services/calibration/) questions * One point of contact in India, so there are no time-zone or language gaps ## Frequently asked questions ### What does an air permeability tester measure? It measures how much air passes through a fabric or sheet material per unit area, at a fixed pressure difference. The FX 3300 LabAir IV also measures pressure drop. ### Which standard should I use for fabric air permeability testing? Use the standard your buyer specifies. ASTM D737 is common for US buyers and EN ISO 9237 for European buyers. Nonwovens often follow WSP 70.1. ### What is a good air permeability value for fabric? There is no single good value. An airbag fabric needs very low permeability, while a sportswear mesh or filter needs high permeability. The right value comes from your product specification. ### Can the LabAir IV test nonwovens, paper and foam? Yes. It covers standards for nonwovens (WSP 70.1, GB/T 24218.15), paper (TAPPI T- 251) and foams (ASTM D3574, EN ISO 7231), besides woven and knitted fabrics. ### Does the FX 3300 LabAir IV need compressed air? No. Compressed air at 5 to 8 bar is needed only for the automatic cleaning function. The instrument can be operated without it. ### How accurate is the LabAir IV? Measurement accuracy is better than ±3% of the displayed value. ### What is the price of an air permeability tester in India? Price depends on the test heads, accessories and configuration you need. Contact Flexitest for a quotation matched to your application. ## Conclusion Air permeability is one of the most important properties of technical textiles, affecting safety, filtration, comfort and export compliance. The FX 3300 LabAir IV air permeability tester combines a wide measuring range, ±3% accuracy, five test areas and compliance with ASTM, ISO, JIS, GB/T, TAPPI and WSP standards in one easy- to-use instrument. ### Get a quote or a demo today Tell us your fabrics and the standards your buyers ask for, and our team will match a configuration to them. [Request a quote](https://flexitest.in/blogs/air-permeability-tester-fx-3300-labair-iv-guide/#elementor-action%3Aaction%3Dpopup%3Aopen%26settings%3DeyJpZCI6Ijk5MzgiLCJ0b2dnbGUiOmZhbHNlfQ%3D%3D) Or call [+91 93263 25135](https://flexitest.in/blogs/air-permeability-tester-fx-3300-labair-iv-guide/+919326325135)· [sales@flexitest.in](https://flexitest.in/blogs/air-permeability-tester-fx-3300-labair-iv-guide/sales@flexitest.in) ![Textest FX 3300 LabAir IV air permeability tester](https://flexitest.in/wp-content/ uploads/2025/04/FX-3300-1.webp "Air Permeability Tester for Technical Textiles: A Complete Guide to the FX 3300 LabAir IV 13") ## FX 3300 LabAir IV⏎ Air Permeability Tester [View LabAir IV details ](https://flexitest.in/technical-textiles/air-permeability-technical-textile/fx3300-lab-air-permeability-tester-textile/) #### Submit Your Details to Download Brochure! Name Email Phone Number Company Name Company Location By clicking the button, I agree and consent to the company’s [Privacy Policy](https://flexitest.in/privacy-policy) Get Instant Quotation ## Coefficient of Friction Tester: What It is, Why It Matters, and How to Choose the Right One - Link: https://flexitest.in/blogs/coefficient-of-friction-tester-selection-guide/ - Published: 2026-09-23T16:47:34+05:30 - Author: kamal ![Conceptual illustration of a coefficient of friction tester with a weighted sled on plastic packaging film](https://flexitest.in/wp-content/uploads/2026/09/coefficient- of-friction-testing.webp "Coefficient of Friction Tester: What It is, Why It Matters, and How to Choose the Right One 14") [Home](https://flexitest.in/)/[Blogs](https://flexitest.in/blogs/)Coefficient of friction # Coefficient of Friction Tester: What It is, Why It Matters, and How to Choose the Right One In this guide 1. [What is a Coefficient of Friction Tester?](https://flexitest.in/blogs/coefficient-of-friction-tester-selection-guide/#cof-section-1) 2. [Why is Coefficient of Friction Testing Important?](https://flexitest.in/blogs/coefficient-of-friction-tester-selection-guide/#cof-section-2) 3. [Test Standards for Coefficient of Friction](https://flexitest.in/blogs/coefficient-of-friction-tester-selection-guide/#cof-section-3) 4. [Importance of COF Testing in the Packaging Industry](https://flexitest.in/blogs/coefficient-of-friction-tester-selection-guide/#cof-section-4) 5. [Recommended Instruments: Labthink C620H & MXD-02](https://flexitest.in/blogs/coefficient-of-friction-tester-selection-guide/#cof-section-5) 6. [Which One Should You Choose?](https://flexitest.in/blogs/coefficient-of-friction-tester-selection-guide/#cof-section-6) ## What is a Coefficient of Friction Tester? A coefficient of friction (COF) tester is a lab instrument used to measure the static and kinetic friction between two surfaces - commonly a plastic film, sheet, foil, paper, or fabric sliding against itself, another material, or a standardized sled. The result, expressed as a numerical coefficient, indicates how easily one surface slides over another. Some instruments, like the Labthink C620H, go a step further and combine COF testing with peel strength testing, allowing labs to evaluate adhesive laminates, medical bandages, release liners, and protective films on the same machine. ## Why is Coefficient of Friction Testing Important? Friction directly affects how a material behaves during manufacturing, packaging, handling, and end use. Getting it wrong can be costly: * Too much friction: causes jamming, tearing, or misfeeds on bag-making and packaging machines * Too little friction: leads to slippage, poor stacking stability, and product damage during transport * Inconsistent friction: results in unpredictable machine speeds and increased downtime * Quality assurance: ensures every batch of film, foil, or laminate performs consistently on the production line By quantifying friction with a COF tester, manufacturers can fine-tune slip additives, coatings, and surface treatments to hit the exact friction performance their equipment and application demand. ## Test Standards for Coefficient of Friction COF testing is governed by several recognized international and national standards, ensuring results are consistent, repeatable, and comparable across labs and suppliers: * ISO 8295 - Plastics: Film and sheeting - Determination of coefficients of friction * ASTM D1894 - Standard Test Method for Static and Kinetic Coefficients of Friction of Plastic Film and Sheeting * TAPPI T816 - Coefficient of friction (kinetic) of paper and paperboard * GB 10006 - Chinese national standard for coefficient of friction of plastic film and sheet * ISO 8510-2 / ASTM D4917 / ASTM D3330 / TAPPI T549 / GB/T 2790, 2791, 2792 - additional peel and friction-related standards (relevant for dual-mode testers like the C620H) Testing to these standards ensures your data is accepted by customers, auditors, and regulatory bodies worldwide. ## Importance of COF Testing in the Packaging Industry The packaging industry relies on precise friction control more than almost any other sector, because packaging films and laminates move constantly through high-speed automated equipment: * Form-Fill-Seal (FFS) machines: require consistent film-to-film and film-to-metal friction for smooth feeding and sealing * Bag-making and pouch-making lines: friction levels affect stacking, opening, and machine runnability * Palletizing and stacking: correct friction prevents cartons, sacks, and woven bags from sliding during storage and transport * Laminates and adhesives: peel strength testing ensures medical bandages, protective films, and multi-layer laminates bond and release as intended * Cold chain and export packaging: friction and adhesion must remain stable across temperature ranges during shipping and storage For flexible packaging converters, film manufacturers, and laminate producers, COF and peel testing are not optional quality checks - they are essential to avoiding line stoppages, customer complaints, and product recalls. ## Recommended Instruments: Labthink C620H & MXD-02 At Flexitest, we supply two proven coefficient of friction testers to match different lab needs and budgets. ### 󠀁[Labthink C620H Friction Peel Tester](https://flexitest.in/packaging-testing-equipments/coefficient-of-friction-tester/)󠁿 The C620H is a dual-function instrument offering both COF and peel strength testing in a single machine, with automatic sled lifting, precision temperature control up to 100°C, and a large touch-screen interface. It's ideal for labs handling laminated films, medical adhesives, release liners, and protective films alongside standard friction testing. * Two test modes: friction and peel * Force accuracy better than 0.5% FS * Test temperature: room temp up to 100°C * Conforms to ISO 8295, ISO 8510-2, ASTM D1894, D4917, D3330, TAPPI T816, T549, GB standards ### 󠀁[PARAM® MXD-02 Coefficient of Friction Tester](https://flexitest.in/packaging-testing-equipments/coefficient-of-friction-tester/)󠁿 The MXD-02 is a dedicated, cost-effective COF tester built for high-volume, routine friction testing across films, paper, textiles, rubber, wood, and even specialty materials like hair, grains, and medical tubing. It's a reliable entry point for labs that need accurate, standards-compliant COF data without the added cost of peel or temperature-control functionality. * Dedicated static and kinetic friction testing * Accuracy of 0.5% FS * Adjustable test speed and customizable sled weights * Conforms to ISO 8295, ASTM D1894, TAPPI T816, GB 10006 ## Which One Should You Choose? | Need | Recommended Instrument | | COF + peel testing in one machine | C620H | | Testing at elevated temperatures | C620H | | Budget-friendly, dedicated COF testing | MXD-02 | | High-volume routine friction checks | MXD-02 | | Testing laminates, medical adhesives, or films | C620H | Both instruments are compliant with major international standards and backed by Labthink's precision engineering. Contact the Flexitest team today to discuss which coefficient of friction tester is right for your lab, or to request a quote for the C620H or MXD-02. ## Discuss your COF testing application Share your material and test requirement. Our team can help you review suitable COF and peel tester options. Name Email Phone Number State Company Name Material / test requirement (optional) ## Recent Posts ## 󠀁[IS 11652 UV Weathering Test for Cement Sacks](https://flexitest.in/blogs/is-11652-uv-weathering-test-cement-sacks/)󠁿 BIS certification under IS 11652 is mandatory for 50 kg cement sacks from 6 October 2026. See what the UV... [Read More](https://flexitest.in/blogs/is-11652-uv-weathering-test-cement-sacks/) [ ⌊Salt Spray Chamber A Complete Guide to Salt Spray Corrosion Testing⌉ ](https://flexitest.in/blogs/salt-spray-chamber-guide/) ## 󠀁[Salt Spray Chamber: A Complete Guide to Salt Spray Corrosion Testing](https://flexitest.in/blogs/salt-spray-chamber-guide/)󠁿 How a salt spray chamber works, the ASTM B117 and ISO 9227 standards, which industries use it and how to... [Read More](https://flexitest.in/blogs/salt-spray-chamber-guide/) [ ⌊HDPE PP Woven Sack Testing BIS Requirements and Choosing the Right UTM⌉ ](https://flexitest.in/blogs/hdpe-pp-woven-sack-testing-bis-utm-selection/) ## 󠀁[HDPE & PP Woven Sack Testing: BIS Requirements and Choosing the Right UTM](https://flexitest.in/blogs/hdpe-pp-woven-sack-testing-bis-utm-selection/)󠁿 Review BIS woven-sack requirements, fabric and seam testing, and verified Tinius Olsen 5ST and 25ST specifications for your HDPE or... [Read More](https://flexitest.in/blogs/hdpe-pp-woven-sack-testing-bis-utm-selection/) [ ⌊air permeability testing made clear⌉ ](https://flexitest.in/blogs/air-permeability-tester-fx-3300-labair-iv-guide/) ## 󠀁[Air Permeability Tester for Technical Textiles: A Complete Guide to the FX 3300 LabAir IV](https://flexitest.in/blogs/air-permeability-tester-fx-3300-labair-iv-guide/)󠁿 What air permeability is, why it matters for airbags, filters and technical textiles, how it is tested, and a close... [Read More](https://flexitest.in/blogs/air-permeability-tester-fx-3300-labair-iv-guide/) ## Weathering Chamber Quotation Checklist for Automotive Labs - Link: https://flexitest.in/blogs/weathering-chamber-rfq-checklist/ - Published: 2026-09-10T10:37:45+05:30 - Author: flexitest ![Sunlight and rain on automotive paint, glazing and exterior trim](https://flexitest. in/wp-content/uploads/2026/09/automotive-weathering-guide-hero-20260908.webp "Weathering Chamber Quotation Checklist for Automotive Labs 18") [Flexitest guides](https://flexitest.in/blogs/)Buying a weathering chamber For automotive laboratories in India # Weathering Chamber⏎ Quotation ChecklistGet the right details into your enquiry. Eight practical steps to describe your test, plan your samples and compare what each chamber quotation includes. [Discuss your requirements ](https://flexitest.in/blogs/weathering-chamber-rfq-checklist/#weathering-enquiry-panel) By Flexitest7 min read10 September 2026 A useful quote starts with a clear brief. A request for quotation (RFQ) tells the supplier what your laboratory needs to do. Send the same brief with each enquiry so you can compare the proposed equipment, included options and support. In this checklist 1. [Your application](https://flexitest.in/blogs/weathering-chamber-rfq-checklist/#rfq-application) 2. [Standard and cycle](https://flexitest.in/blogs/weathering-chamber-rfq-checklist/#rfq-standard) 3. [Sample plan](https://flexitest.in/blogs/weathering-chamber-rfq-checklist/#rfq-samples) 4. [Light and irradiance](https://flexitest.in/blogs/weathering-chamber-rfq-checklist/#rfq-light) 5. [Temperature and moisture](https://flexitest.in/blogs/weathering-chamber-rfq-checklist/#rfq-conditions) 6. [Evaluation and endpoint](https://flexitest.in/blogs/weathering-chamber-rfq-checklist/#rfq-results) 7. [Laboratory requirements](https://flexitest.in/blogs/weathering-chamber-rfq-checklist/#rfq-installation) 8. [Quotation scope](https://flexitest.in/blogs/weathering-chamber-rfq-checklist/#rfq-quotation) Have some of the details already? [Start your enquiry ](https://flexitest.in/blogs/weathering-chamber-rfq-checklist/#weathering-enquiry-panel) 01 / Start with the application ## Describe the part and the decision. What are you testing, where is it used, and what change matters to your customer? Name the material or coating and the component it belongs to. State whether it faces outdoor exposure or receives light through vehicle glazing. Then describe the property you want to assess. Example objective ### Interior trim Compare colour change in a dashboard covering under the customer's specified exposure. Example objective ### Exterior coating Check gloss retention and visible surface damage after the agreed test cycle. Still deciding between exposure methods? Read our [automotive guide to xenon and UV weathering](https://flexitest.in/blogs/xenon-vs-uv-weathering-automotive-test-brief/). 02 / Bring the complete requirement ## Include the standard, edition and cycle. A standard number helps identify the test. Its edition, selected cycle and the customer's material specification determine the details the chamber must deliver. Common references you may see in a test requirement| Exposure | Examples | | Xenon arc | ASTM G155 for apparatus operation; ISO 4892-2 for plastics; ISO 16474-2 for paints and varnishes. SAE J2412 addresses automotive interior trim and SAE J2527 exterior materials. | | Fluorescent UV | ASTM G154 for apparatus operation; ISO 4892-3 for plastics; ASTM D4587 for paints and related coatings. | **Include the customer's additional requirements.** Record any specified lamp, filter, cycle variation, reference material or equipment qualification. Ask the supplier to identify the required options and any differences from your method in the quotation. 03 / Plan the complete batch ## Give the sample size and the total quantity. Capacity depends on what fits in the holders. A flat test panel and a shaped automotive component can need very different loading arrangements. **Dimensions**Length × width × thickness in mm, plus a drawing or photo for shaped parts. **Quantity**Every test specimen, including replicates and control specimens. **Mounting**Exposed surface, backing, fixtures and any area that must remain uncovered. **Workload**Expected batches, exposure duration and the amount of work planned for the chamber. **Count every specimen, including repeats.** Ask for the usable capacity with your holder and sensor arrangement, and allow for any controls required by the method. 04 / Specify the light ## Keep the lamp, filter and irradiance together. For xenon testing, identify the required optical filter or glazing condition. For fluorescent UV, name the lamp type specified by the method. Record the irradiance setting exactly, including its unit and measurement wavelength or band. At a control wavelength ### W/m²/nm Give the value and the wavelength in nm, such as the specified setting at 340 nm. Across a wavelength band ### W/m² Give the value and both ends of the band, such as 300–400 nm. These are different measurement bases. A bare number or lamp wattage cannot describe the required irradiance. The control wavelength also does not describe the lamp's full spectrum. 05 / Describe each stage ## Separate temperature, humidity and wet stages. Write down the settings for each light and dark stage. This lets the supplier check whether the complete combination can be achieved. Details to copy from your required cycle| Setting | What to include | | Black-panel or black-standard temperature | Specify BPT or BST as required by the method, with its temperature in °C. | | Chamber air | A separate air-temperature setting if the method specifies one. | | Humidity and moisture | Required relative humidity, water spray or condensation stages, and their timing. | | Stage sequence | Light/dark sequence, stage durations and any cooling or special exposure conditions. | BPT, BST and chamber-air temperature describe different measurements. Keep the sensor name with its value when you share the requirement. 06 / Define the result you need ## Agree when to stop and what to measure. State the exposure endpoint: a specified number of hours or a radiant-exposure target with its units and wavelength basis. Add any inspection intervals. Then identify how the material will be evaluated-for example, colour change, gloss retention, cracking or a relevant mechanical property-and the customer's acceptance limit. Record the starting condition so the change can be assessed. **Plan the evaluation equipment too.** The weathering chamber creates the exposure. Colour, gloss or mechanical measurements may need separate instruments or laboratory services, which should be included in your project plan. 07 / Check the laboratory ## Make room for the complete installation. Share the installation city and site constraints. Ask for the installation drawing and utility schedule for the actual configuration being quoted. **Access and space**Doorways, lifts, floor space, service clearance and the route into the laboratory. **Electrical supply**Voltage, phase, frequency, total connected load and the required dedicated supply. **Water and drainage**Required water quality and flow, purification equipment, supply connections and drainage. **Room conditions**Ambient temperature, ventilation, heat rejection and any separate cooling or compressed-air needs. The quotation should identify which utility equipment is included and which must be arranged at your site. 08 / Compare the written scope ## Check what the price actually includes. Use the same list when reviewing quotations. A clear inclusion or exclusion makes an equipment offer easier to assess. Ask each quotation to confirm these items| Item | Confirmation to request | | Chamber and options | Exact model, lamp, filters, control channels, holders and usable specimen capacity. | | Method requirements | Required options, calibration documents, customer-required qualification evidence and any deviations. | | Installation and handover | Utility equipment, commissioning, operator training and responsibilities at your site. | | Ongoing support | Maintenance needs, consumables, spare lamps and filters, service support and warranty terms. | | Commercial scope | Delivery timing, freight, taxes, payment terms and exclusions. | Keep the checklist with your project ## An editable brief for your team. Use our two-page Word checklist to collect the test, sample and installation details before discussing your requirement. [Download the editable checklist (Word) ](https://flexitest.in/wp-content/uploads/2026/09/Flexitest_Automotive_Weathering_Enquiry_Checklist.docx) Bring your requirement to Flexitest ## Start with the details you have. You do not need every answer to begin. Share your material, sample dimensions, customer standard or testing objective, and laboratory location. Mark any undecided settings as “Please advise”. [Discuss your chamber requirements ](https://flexitest.in/blogs/weathering-chamber-rfq-checklist/#weathering-enquiry-panel) You can also explore the [Flexitest xenon and UV weathering chamber range](https://flexitest.in/automotive/accelerated-weathering-chamber/) before sending your enquiry. Technical background for standards and units [ASTM G155](https://store.astm.org/g0155-25.html) and [ASTM G154](https://store.astm.org/g0154-23.html) describe the operation of xenon and fluorescent UV exposure apparatus. The [CIE definition of spectral irradiance](https://cie.co.at/eilvterm/17-21-056) explains the wavelength-based unit. Use the applicable complete standard and customer specification to define your actual test. ## Discuss your chamber requirements Share your material, specimen dimensions and required standard or test cycle. Include your laboratory location and any points where you need advice. Name Email Phone Number State Company Name Material / test requirement (optional) ## Recent Posts ## 󠀁[IS 11652 UV Weathering Test for Cement Sacks](https://flexitest.in/blogs/is-11652-uv-weathering-test-cement-sacks/)󠁿 BIS certification under IS 11652 is mandatory for 50 kg cement sacks from 6 October 2026. See what the UV... [Read More](https://flexitest.in/blogs/is-11652-uv-weathering-test-cement-sacks/) [ ⌊Salt Spray Chamber A Complete Guide to Salt Spray Corrosion Testing⌉ ](https://flexitest.in/blogs/salt-spray-chamber-guide/) ## 󠀁[Salt Spray Chamber: A Complete Guide to Salt Spray Corrosion Testing](https://flexitest.in/blogs/salt-spray-chamber-guide/)󠁿 How a salt spray chamber works, the ASTM B117 and ISO 9227 standards, which industries use it and how to... [Read More](https://flexitest.in/blogs/salt-spray-chamber-guide/) [ ⌊HDPE PP Woven Sack Testing BIS Requirements and Choosing the Right UTM⌉ ](https://flexitest.in/blogs/hdpe-pp-woven-sack-testing-bis-utm-selection/) ## 󠀁[HDPE & PP Woven Sack Testing: BIS Requirements and Choosing the Right UTM](https://flexitest.in/blogs/hdpe-pp-woven-sack-testing-bis-utm-selection/)󠁿 Review BIS woven-sack requirements, fabric and seam testing, and verified Tinius Olsen 5ST and 25ST specifications for your HDPE or... [Read More](https://flexitest.in/blogs/hdpe-pp-woven-sack-testing-bis-utm-selection/) [ ⌊air permeability testing made clear⌉ ](https://flexitest.in/blogs/air-permeability-tester-fx-3300-labair-iv-guide/) ## 󠀁[Air Permeability Tester for Technical Textiles: A Complete Guide to the FX 3300 LabAir IV](https://flexitest.in/blogs/air-permeability-tester-fx-3300-labair-iv-guide/)󠁿 What air permeability is, why it matters for airbags, filters and technical textiles, how it is tested, and a close... [Read More](https://flexitest.in/blogs/air-permeability-tester-fx-3300-labair-iv-guide/) ## Automotive Weathering Testing: Xenon vs UV Explained - Link: https://flexitest.in/blogs/xenon-vs-uv-weathering-automotive-test-brief/ - Published: 2026-09-07T17:03:48+05:30 - Author: flexitest ![Sunlight and rain beads on a car's paint, glazing and exterior trim](https://flexitest. in/wp-content/uploads/2026/09/automotive-weathering-guide-hero-20260908.webp "Automotive Weathering Testing: Xenon vs UV Explained 22") [Flexitest guides](https://flexitest.in/blogs/)Automotive materials A practical guide for automotive teams # Automotive Weathering Testing: Xenon vs UV Explained Why do paints fade and plastics lose their finish? Understand the tests that help you choose materials for life on a vehicle. By Flexitest12 min readUpdated 8 September 2026 The essentials, at a glance. * **The purpose:** compare changes caused by light, heat and moisture. * **The methods:** filtered xenon arc or fluorescent UV exposure. * **The applications:** paints, exterior plastics and interior trim. * **The starting point:** your material, customer standard and test cycle. In this guide 1. [The basics](https://flexitest.in/blogs/xenon-vs-uv-weathering-automotive-test-brief/#weathering-purpose) 2. [Xenon vs UV](https://flexitest.in/blogs/xenon-vs-uv-weathering-automotive-test-brief/#weathering-comparison) 3. [Automotive uses](https://flexitest.in/blogs/xenon-vs-uv-weathering-automotive-test-brief/#weathering-application) 4. [The test process](https://flexitest.in/blogs/xenon-vs-uv-weathering-automotive-test-brief/#weathering-process) 5. [Testing standards](https://flexitest.in/blogs/xenon-vs-uv-weathering-automotive-test-brief/#weathering-standards) 6. [Chamber options](https://flexitest.in/blogs/xenon-vs-uv-weathering-automotive-test-brief/#weathering-models) 7. [Getting started](https://flexitest.in/blogs/xenon-vs-uv-weathering-automotive-test-brief/#weathering-brief) 8. [Your questions](https://flexitest.in/blogs/xenon-vs-uv-weathering-automotive-test-brief/#weathering-blog-faq) Already have a test requirement? [Build your testing brief ](https://flexitest.in/blogs/xenon-vs-uv-weathering-automotive-test-brief/#weathering-enquiry-panel) 01 / The basics ## A car lives outdoors.⏎ Its materials need to cope. Automotive weathering testing studies how materials change under controlled exposure to light, heat and moisture. Think of a car parked outside every day. Its paint, plastic trims and interior surfaces receive sunlight and heat. Rain and moisture add another challenge for the parts on the outside. Colours may fade, coatings may lose their shine, and some plastics may develop cracks. An accelerated weathering chamber helps a laboratory compare these changes using a planned exposure cycle. **Light**Colour and surface changes **Heat**Controlled temperature exposure **Moisture**Wet stages when the cycle calls for them **Picture this:** a component supplier has two plastic formulations for an exterior trim. Exposing both to the same agreed conditions helps the team compare colour change and surface damage before choosing a material. 02 / Choose the exposure ## Xenon vs UV:⏎ compare the light reaching your sample. A dashboard fading behind glass and a bumper trim cracking outdoors pose different questions. To choose the exposure, look at **which wavelengths reach the material** and **how much light it receives**. Spectrum & wavelengthThe mix of light in the test. Wavelength is measured in nanometres(** nm**). IrradianceThe radiant power reaching a unit area of the sample. Always read the value **together with its wavelength or band**. The difference at a glance UltravioletUVVisible lightColour & appearanceInfraredIR **Filtered xenon arc** Broader sunlight spectrum · shaped by the filter **Fluorescent UV** UV-focusedDoes not reproduce the full sunlight spectrum Conceptual coverage, not a measured intensity graph. The lamp and filter determine the actual spectrum. UV + visible + infrared ### Xenon arc For studying material changes under a broader sunlight spectrum. ![Flexitest SX/6500/H xenon-arc weathering chamber](https://flexitest.in/wp-content/ uploads/2025/04/SX-6500H-1.webp "Automotive Weathering Testing: Xenon vs UV Explained 23") Flexitest SX/6500/H #### Which wavelengths? Filtered xenon includes UV, visible light and infrared. A daylight-filtered exposure can begin near **295 nm** and extend through the visible region into infrared. The shortest wavelengths reaching the sample depend on the filter. #### Why the filter matters Daylight filters represent direct outdoor sunlight. Window-glass filters remove more short-wave UV to represent light passing through glass. Some automotive methods specify extended-UV or other particular filters, so use the customer’s required filter system. #### Where irradiance is controlled **340 nm** or **420 nm**, or a band such as **300–400 nm**, depending on the method and instrument configuration. A 340 nm control point does not mean the lamp emits only 340 nm light. **On a vehicle**Compare paint colour and gloss, or fading in dashboard, door-trim and upholstery materials under the required glazing exposure. **Relevant references:** ASTM G155, ISO 4892-2, ISO 16474-2, SAE J2412 and SAE J2527. Choose the UV lamp ### Fluorescent UV For studying UV-driven deterioration with the specified heat and moisture cycle. ![Flexitest ST fluorescent UV weathering chamber](https://flexitest.in/wp-content/ uploads/2025/04/ST-UVA-_-UVB.webp "Automotive Weathering Testing: Xenon vs UV Explained 24") Flexitest ST · UVA / UVB options #### UVA-340: a sunlight UV match UVA-340 lamps closely match the short-wave UV portion of sunlight over approximately** 295–365 nm**. This is the sunlight-matching region; the lamp can emit at other wavelengths too. #### UVB-313: shorter wavelengths UVB-313 lamps concentrate their output around **280–360 nm**, with a peak near ** 313 nm**. They include wavelengths below about **295 nm**, the lower limit normally present in sunlight at ground level. This can accelerate damage but may also produce failures that outdoor sunlight would not. #### Where irradiance is controlled UVA-340 is commonly controlled at **340 nm**. UVB control may be at **310 or 313 nm**, depending on the instrument and method. Check the specified control point; the lamp name alone is not enough. **On a vehicle**Compare cracking, chalking or loss of gloss in exterior plastics and coatings under a specified UV, temperature and wet cycle. **Relevant references:** ASTM G154, ISO 4892-3 and ASTM D4587. Read the setting correctly ### What does an irradiance level actually tell you? Consider **0.55 W/m²/nm at 340 nm**. This describes spectral irradiance at a specified UV wavelength. It does not describe the lamp’s electrical wattage or the total light across its spectrum. **0.55**The selected level **W/m²/nm**Power per area, per wavelength interval **340 nm**The wavelength used for control #### Examples you may encounter in test methods Xenon · SAE J2527**0.55 W/m²/nm**at 340 nm UVA-340 · ASTM G154 Cycle 1**0.89 W/m²/nm**at 340 nm Xenon · ASTM G155 Cycle 5**1.10 W/m²/nm**at 420 nm These are method examples, not universal settings or Flexitest chamber operating limits. Confirm the standard edition, complete cycle and required configuration before testing. **A wavelength reading and a band total are different.** A setting in **W/m² over 300–400 nm** totals irradiance across that UV band. It cannot be compared directly with **W/m²/nm at 340 nm** or **420 nm**. Converting between them requires the spectral distribution. **More irradiance does not automatically mean a better test.** Changing intensity can change the rate of damage; changing the spectrum can change the type of damage. Keep the specified lamp, filter, irradiance, temperature and moisture cycle together. Xenon and UV results are not interchangeable. ### Bring the light settings into your chamber shortlist. For a Flexitest xenon or UV chamber, share the **lamp or filter, irradiance value and units, control wavelength or band, test cycle and sample size**. We can review the proposed configuration against your customer’s requirement. [Explore the Flexitest chamber options ](https://flexitest.in/blogs/xenon-vs-uv-weathering-automotive-test-brief/#weathering-models) 03 / Real automotive applications ## Different parts.⏎ Different durability questions. Start with where the material is used and the change that would matter to the customer. ![Rain droplets on automotive paint beside the windscreen and interior](https:// flexitest.in/wp-content/uploads/2026/09/automotive-weathering-sunlight-moisture- 20260907.webp "Automotive Weathering Testing: Xenon vs UV Explained 25") Paint, exterior plastics and cabin materials experience different exposure conditions. ### Paints & coatings **Where:** body panels, painted components and protective finishes. **What to check:** colour change, loss of gloss, cracking or changes in surface appearance. ### Exterior plastics **Where:** bumper trims, mirror housings and exposed plastic components. **What to check:** fading, surface deterioration and changes in relevant material properties. ### Interior materials **Where:** dashboards, door trims, upholstery and decorative surfaces. **What to check:** changes in colour and appearance under the specified light and heat exposure. Automotive manufacturers, component suppliers, paint and polymer developers, and quality-control laboratories use these comparisons to inform material decisions. 04 / From sample to decision ## How does the test work? The chamber creates the exposure. Your agreed evaluations establish the result. 1. **Prepare the samples.**Use representative pieces of the material, coating or component, prepared as the method requires. 2. **Set the exposure.**Record the lamp or filter, irradiance with its control wavelength or band, temperature and wet stages from the agreed test cycle. 3. **Run the cycle.**Expose the samples for the specified duration or exposure endpoint. 4. **Compare the changes.**Assess colour, gloss, visible damage or other properties relevant to the application. **Does 1,000 hours mean years on the road?** There is no universal conversion. Use the test to answer a defined question, such as which finish performs better under the same conditions. Predicting service life needs supporting evidence for the material and its real environment. 05 / Standards made practical ## Which standard does⏎ your customer need? The standard helps define the exposure. The material specification and customer requirement also determine the cycle, evaluation and acceptance limits. Common automotive weathering references| Standard | What it covers | Exposure | | ASTM G155 | Operating xenon arc exposure equipment | Xenon arc | | ISO 4892-2 | Xenon exposure of plastics, including daylight and window-glass-filtered light | Xenon arc | | ISO 16474-2 | Xenon exposure of paints and varnishes | Xenon arc | | SAE J2412 | Automotive interior trim materials | Controlled-irradiance xenon arc | | SAE J2527 | Automotive exterior materials | Controlled-irradiance xenon arc | | ASTM G154 | Operating fluorescent UV exposure equipment | Fluorescent UV | | ISO 4892-3 | Fluorescent UV exposure of plastics | Fluorescent UV | | ASTM D4587 | UV and condensation exposure of paints and related coatings | Fluorescent UV | **Bring the complete requirement.** Share the standard, edition and required cycle with Flexitest. We will check the proposed chamber's lamp, filter, controls and sample setup before finalising the configuration. SAE and OEM programmes may also require specific equipment qualification. 06 / Explore the Flexitest range ## A chamber format⏎ for your laboratory's workload. Start with the exposure your customer requires: lamp or filter, irradiance level and control wavelength. Then compare sample capacity and installation space. Flexitest can check the proposed model and configuration against that complete requirement. ![Flexitest accelerated weathering chamber range](https://flexitest.in/wp-content/ uploads/2025/07/accelerated_weathering_chamber_main_banner-1-2.webp "Automotive Weathering Testing: Xenon vs UV Explained 26") Explore the range, then review the configuration against your test requirement. ![SX/1000 benchtop xenon chamber](https://flexitest.in/wp-content/uploads/2025/04/ SX-1000.webp "Automotive Weathering Testing: Xenon vs UV Explained 27") SX/1000 ### Benchtop xenon chamber Compare a smaller set of flat specimens under filtered xenon exposure. 9 samples · 150 × 70 mm [View SX/1000 details →](https://flexitest.in/automotive/accelerated-weathering-chamber/xenon-test-chamber-sx-1000/) ![SX/6500/H larger-capacity xenon chamber](https://flexitest.in/wp-content/uploads/ 2025/04/SX-6500H-1.webp "Automotive Weathering Testing: Xenon vs UV Explained 28") SX/6500/H ### Larger-capacity xenon chamber Accommodate larger comparison programmes with a rotating sample rack. 63–65 samples · 150 × 70 mm [View SX/6500/H details →](https://flexitest.in/automotive/accelerated-weathering-chamber/xenon-test-chamber-sx6500h/) ![ST/UV/A floor-standing uv chamber](https://flexitest.in/wp-content/uploads/2025/ 04/ST-UVA-_-UVB.webp "Automotive Weathering Testing: Xenon vs UV Explained 29") ST/UV/A ### Floor-standing UV chamber Compare materials with fluorescent UV exposure in a floor-standing format. 48 samples · 150 × 70 mm [View ST/UV/A details →](https://flexitest.in/automotive/accelerated-weathering-chamber/uv-chamber-st-uva/) ![SB/UV/A benchtop uv chamber](https://flexitest.in/wp-content/uploads/2025/04/SB- UVA-_-UVB.webp "Automotive Weathering Testing: Xenon vs UV Explained 30") SB/UV/A ### Benchtop UV chamber Bring fluorescent UV exposure to a smaller laboratory footprint. 18 samples · 150 × 70 mm [View SB/UV/A details →](https://flexitest.in/automotive/accelerated-weathering-chamber/uv-chamber-benchtop-sb-uva/) Listed capacities apply to 150 × 70 mm specimens. Controls and repeat specimens occupy positions within those totals. Other sizes, shaped parts and holder arrangements require a separate capacity check. [Compare full chamber specifications ](https://flexitest.in/automotive/accelerated-weathering-chamber/) 07 / Your next step ## Start with three⏎ straightforward questions. What are you testing?An exterior plastic trim, a painted panel or an interior fabric? Share sample dimensions and the expected batch size. What change matters?Fading, loss of shine, cracking or another performance concern? Identify the result you need to compare. What does the customer require?Share the standard, edition and cycle, including lamp or filter, irradiance with units and control wavelength, and the material's acceptance criteria. ### Turn your requirement into a chamber shortlist. Flexitest can help you review xenon and UV options around your application, test cycle and sample workload. [Discuss your application ](https://flexitest.in/blogs/xenon-vs-uv-weathering-automotive-test-brief/#weathering-enquiry-panel) [Explore weathering chambers](https://flexitest.in/automotive/accelerated-weathering-chamber/) 08 / A little more detail ## Questions from automotive teams Why test a dashboard or door trim if it stays inside the vehicle? **Interior materials still receive light and heat through the glazing.** A dashboard surface, door trim or upholstery material can change in colour or appearance during use. Testing helps a supplier compare finishes or formulations before selecting a material for production. SAE J2412 addresses xenon exposure of automotive interior trim. ISO 4892-2 may also appear in a plastics specification. The chosen filter and cycle must match the customer’s requirement; an interior test should not simply copy the conditions used for an exterior component. What can weathering testing tell us about exterior automotive parts? **It helps reveal changes that affect appearance and material durability.** Think of a black exterior moulding losing its finish, a painted surface losing gloss, or a plastic surface developing cracks. A controlled exposure lets the team evaluate candidate materials under a defined set of conditions. SAE J2527 covers xenon exposure of automotive exterior materials. The customer’s specification determines the exposure and the checks required afterwards. A weathering result answers the chosen light, heat and moisture question; separate tests may still be needed for other service conditions. Do a plastic trim part and a painted panel use the same testing standard? **They may use the same type of light source but different material-specific methods.** ISO 4892-2 and ISO 4892-3 cover plastics exposed to xenon and fluorescent UV respectively. ISO 16474-2 covers xenon exposure of paints and varnishes; ASTM D4587 covers UV and condensation exposure of paints and related coatings. ASTM G155 and ASTM G154 describe how the respective exposure apparatus is operated. They do not, by themselves, tell you how much fading or cracking your customer will accept. Ask for the material specification as well as the exposure standard. What does a useful weathering test result look like? **It connects a measured change to a practical decision.** For two dashboard finishes, that might mean comparing colour change after the same agreed exposure. For exterior paint, it could mean checking gloss retention and visible surface damage. Relevant mechanical tests may also be needed when strength is part of the requirement. Record the starting condition, exposure settings and evaluation method so the comparison is clear. A chamber does not automatically produce a durability pass: the results must be assessed against the customer’s acceptance criteria. If a sample survives 1,000 hours, how long will it last on a car? **There is no fixed hours-to-years answer.** Sunlight, temperature, moisture, location and the material itself influence outdoor ageing. A laboratory cycle also exposes the sample in a particular way, so a simple multiplication can give a misleading lifespan claim. The useful question is whether the material meets the agreed requirement or performs better than an alternative in a controlled comparison. Predicting service life requires evidence linking laboratory exposure with real-world behaviour for that material and application. Why might the same material behave differently in xenon and UV tests? **The same reading at one wavelength can come from two different spectra.** For example, matching xenon and UVA-340 at 340 nm does not match their total light or their visible-light exposure. Filtered xenon includes UV, visible and infrared; ordinary UVA/UVB weathering lamps focus on UV. Temperature and wet stages also influence the result. For plastics, ISO 4892-2 and ISO 4892-3 distinguish these two exposure methods. Use the customer’s specified method and lamp choice when comparing materials. A more severe-looking result is not automatically a better prediction of vehicle service life. Does a weathering test also show whether interior materials will cause windscreen fogging? **No-these tests answer different questions.** Weathering examines changes caused by light, heat and moisture exposure, such as fading or surface deterioration. Fogging testing examines substances released from heated interior materials that can condense on a cooler surface. For a dashboard covering or upholstery material, a development programme may need both appearance-durability and fogging results. Passing one test does not establish performance in the other; follow the separate requirements in the customer’s material specification. How can an automotive supplier start a first weathering test programme? **Start with one component and one clear question.** Are you comparing two trim colours, checking a coating change, or assessing an exterior plastic formulation? Obtain the customer’s standard, edition and cycle, then agree the sample preparation, exposure endpoint and measurements needed to make the decision. Share this brief and your sample sizes with Flexitest. The range includes SX/1000 and SX/6500/H xenon chambers, plus ST/UV/A and SB/UV/A fluorescent UV chambers. Flexitest can review the required exposure and sample arrangement to help identify a suitable configuration. Continue exploring ## Related automotive testing [**Accelerated weathering chambers**Compare xenon and UV models, sample capacity and key specifications._Explore the range _](https://flexitest.in/automotive/accelerated-weathering-chamber/) [**FT-F1 automotive fogging tester**Understand the separate question of condensable emissions from interior materials._Explore fogging testing _](https://flexitest.in/automotive/testing-instruments-for-auto-ancilary-products/ft-f1-fogging-tester/) ## Discuss your weathering application Share your material and test requirement. Our team can help you review suitable xenon and UV chamber options. Name Email Phone Number State Company Name Material / test requirement (optional) ## Recent Posts ## 󠀁[IS 11652 UV Weathering Test for Cement Sacks](https://flexitest.in/blogs/is-11652-uv-weathering-test-cement-sacks/)󠁿 BIS certification under IS 11652 is mandatory for 50 kg cement sacks from 6 October 2026. See what the UV... [Read More](https://flexitest.in/blogs/is-11652-uv-weathering-test-cement-sacks/) [ ⌊Salt Spray Chamber A Complete Guide to Salt Spray Corrosion Testing⌉ ](https://flexitest.in/blogs/salt-spray-chamber-guide/) ## 󠀁[Salt Spray Chamber: A Complete Guide to Salt Spray Corrosion Testing](https://flexitest.in/blogs/salt-spray-chamber-guide/)󠁿 How a salt spray chamber works, the ASTM B117 and ISO 9227 standards, which industries use it and how to... [Read More](https://flexitest.in/blogs/salt-spray-chamber-guide/) [ ⌊HDPE PP Woven Sack Testing BIS Requirements and Choosing the Right UTM⌉ ](https://flexitest.in/blogs/hdpe-pp-woven-sack-testing-bis-utm-selection/) ## 󠀁[HDPE & PP Woven Sack Testing: BIS Requirements and Choosing the Right UTM](https://flexitest.in/blogs/hdpe-pp-woven-sack-testing-bis-utm-selection/)󠁿 Review BIS woven-sack requirements, fabric and seam testing, and verified Tinius Olsen 5ST and 25ST specifications for your HDPE or... [Read More](https://flexitest.in/blogs/hdpe-pp-woven-sack-testing-bis-utm-selection/) [ ⌊air permeability testing made clear⌉ ](https://flexitest.in/blogs/air-permeability-tester-fx-3300-labair-iv-guide/) ## 󠀁[Air Permeability Tester for Technical Textiles: A Complete Guide to the FX 3300 LabAir IV](https://flexitest.in/blogs/air-permeability-tester-fx-3300-labair-iv-guide/)󠁿 What air permeability is, why it matters for airbags, filters and technical textiles, how it is tested, and a close... [Read More](https://flexitest.in/blogs/air-permeability-tester-fx-3300-labair-iv-guide/) ## Dynamic Climate Chamber vs. Drying and Heating Chamber: How to Choose the Right One - Link: https://flexitest.in/blogs/dynamic-climate-chamber-vs-drying-heating-chamber/ - Published: 2026-09-07T16:17:13+05:30 - Author: kamal 1. [Home](https://flexitest.in) # Dynamic Climate Chamber vs. Drying and Heating Chamber: How to Choose the Right One Walk into almost any materials testing, quality assurance, or R&D lab, and you'll find some version of a temperature-controlled chamber humming in the corner. But "temperature chamber" is a broad category, and two of the most commonly confused types are the **dynamic climate chamber (DCC)** and the **drying and heating chamber( DHC)**. They can look similar from the outside - insulated steel boxes with a control panel - but they're built to do very different jobs. Choosing the wrong one is an expensive mistake: you either pay for climate-simulation capability you'll never use, or you under-equip your lab for the compliance and durability tests your standards actually require. ⚡ The Short Version 🌡 Dynamic Climate Chamber (DCC) Simulates **changing environmental conditions** - temperature and humidity - to see how a product behaves in the real world over time. 🔥 Drying & Heating Chamber (DHC) Applies **stable, controlled heat** to dry, cure, sterilize, or age a sample as efficiently and evenly as possible. 01 ## What is a Dynamic Climate Chamber (DCC)? A dynamic climate chamber is purpose-built for **cyclical and complex climate testing**. It's designed to move quickly and repeatedly between temperature and humidity extremes, replicating what a product might experience across seasons, altitude changes, or transport conditions - in a fraction of the real-world time. Typical Features * **Wide temperature range:** commonly -40°C to 180°C, with specialized models reaching down to -70°C for cold-climate testing * **Humidity control:** many models regulate relative humidity across roughly 10% to 98% RH using precision sensors and vapour humidification * **Fast, repeatable cycling:** rapid alternation speeds (often around 5 K/min) enable standards-compliant cyclical testing * **Programmability:** onboard controllers typically store dozens of programs with up to 100 process steps each for unattended multi-day profiles * **Standards compliance:** designed to meet current IEC, EN, and MIL testing standards Best Use Cases A DCC earns its keep in **stress testing, stability testing, and durability testing** across automotive components, electronics, aerospace parts, coatings, and materials science - anywhere you need to know how something holds up when climate conditions swing. 02 ## What is a Drying and Heating Chamber (DHC)? A drying and heating chamber is the workhorse for **routine thermal processing**: drying, heating, curing, sterilizing, and material aging. There's no humidity simulation and no rapid climate cycling - the goal is stable, uniform, energy-efficient heat. Typical Features * **Broad, steady temperature range:** typically 5°C to 300°C - well above what climate chambers offer, since drying and sterilization tasks call for sustained high heat * **Natural or forced convection:** natural-convection models suit gentle gradual drying; forced-convection models use fans for fast homogeneous heat distribution * **Temperature uniformity:** quality units maintain tight accuracy and recover quickly after door openings for repeat-batch work * **Efficiency-focused design:** strong thermal insulation and optimized heating elements keep energy costs low during long continuous cycles * **Application versatility:** used across industry, science, and QA including processes governed by EN 1539:2015 Best Use Cases A DHC earns its keep in **routine lab drying, sterilization, curing, tempering**, and any process where you need dependable, uniform heat rather than simulated environmental stress. 03 ## At a glance - key differences ### 🌡 Dynamic Climate Chamber * Simulates variable climate conditions * Temperature: -70°C to 180°C * Humidity: 10% – 98% RH * Rapid programmable cycling (~5 K/min) * Stress, stability & durability testing * Meets IEC, EN, MIL standards ### 🔥 Drying & Heating Chamber * Applies stable, controlled heat * Temperature: 5°C to 300°C * No humidity control * Steady-state heating only * Drying, curing, sterilization, aging * Meets EN 1539:2015 & related standards 04 ## Side-by-side comparison | Feature | Dynamic Climate Chamber | Drying & Heating Chamber | | Primary function | Simulate variable climate conditions | Apply stable, controlled heat | | Temperature range | -70°C to 180°C (model-dependent) | 5°C to 300°C | | Humidity control | ✓ Yes - 10–98% RH | ✗ No | | Cycling speed | Rapid (~5 K/min), programmable | Steady-state heating only | | Typical use cases | Stress, stability, cyclical durability tests | Drying, sterilization, curing, aging, tempering | | Standards met | IEC, EN, MIL for DCC | EN 1539:2015 and related standards | | Best for | Simulating real-world variation | Efficient thermal processing | 05 ## How to choose between a DCC and a DHC Ask yourself one question: **does your test need to change conditions, or just apply heat?** ### Choose based on your testing need 🌡 Choose a DCC if you need to... Validate how a product survives temperature swings, humidity exposure, or seasonal cycling - for compliance testing, product qualification, or R&D stress analysis 🔥 Choose a DHC if you need to... Dry samples, cure materials, sterilize equipment, or run steady thermal treatments- a DHC does the job more efficiently and at a lower cost 💡 **Many labs run both side by side:** a DHC for daily sample prep and processing, and a DCC for the more demanding qualification and stability testing that standards or customers require. Beyond the DCC-vs-DHC decision, the right unit also depends on chamber volume, required ramp rates, load size, refrigerant type, controller and data-logging needs, and industry-specific standards - details that are hard to generalize in a blog post. Explore our [automotive dynamic climate chambers](https://flexitest.in/automotive/dynamic-climate-chamber/) or [packaging drying and heating chambers](https://flexitest.in/packaging-testing-equipments/drying-heating-chambers/). ## Not sure which chamber or oven fits your application? Chamber selection gets specific fast – temperature range, humidity needs, chamber volume, ramp rates, load size, and the standards you’re testing against all shape the right recommendation. Tell us about your particular requirement below and we’ll match it to the right chamber or oven.   ## Takes about 2 minutes. The more detail you give us, the more precise the recommendation. Your name Email Phone No. Industry / company Name Company Location What you're testing * Required temperature range * Humidity control needed? Chamber size or typical load volume Standards you need to comply with IEC EN MIL ISTA None / not sure Anything else we should know ## OR [ WhatsApp ](https://api.whatsapp.com/send?phone=919326325135&text=Hello%2C%20I%E2%80%99m%20looking%20for%20a%20Universal%20Testing%20Machine.) * [ Call On +91 93263 25135 ](https://flexitest.in/blogs/dynamic-climate-chamber-vs-drying-heating-chamber/%20+9193263%2025135) Not sure which chamber fits your application? Chamber selection gets specific fast. Tell us about your requirement and we’ll help you match it to the right chamber or oven. * What you're testing and your industry * Required temperature range and humidity needs * Chamber size or typical load volume * Standards you need to comply with (IEC, EN, MIL, ISTA etc.) * Whether the unit will be for routine processing or qualification testing [ Send us your requirement ](https://flexitest.in/blogs/dynamic-climate-chamber-vs-drying-heating-chamber/#elementor-action%3Aaction%3Dpopup%3Aopen%26settings%3DeyJpZCI6IjE0NDQ4IiwidG9nZ2xlIjpmYWxzZX0%3D) or email [sales@flexitest.in ](https://flexitest.in/blogs/dynamic-climate-chamber-vs-drying-heating-chamber/sales@flexitest.in)· www.flexitest.in ## Recent Post ## 󠀁[IS 11652 UV Weathering Test for Cement Sacks](https://flexitest.in/blogs/is-11652-uv-weathering-test-cement-sacks/)󠁿 BIS certification under IS 11652 is mandatory for 50 kg cement sacks from 6 October 2026. See what the UV... [Read More](https://flexitest.in/blogs/is-11652-uv-weathering-test-cement-sacks/) [ ⌊Salt Spray Chamber A Complete Guide to Salt Spray Corrosion Testing⌉ ](https://flexitest.in/blogs/salt-spray-chamber-guide/) ## 󠀁[Salt Spray Chamber: A Complete Guide to Salt Spray Corrosion Testing](https://flexitest.in/blogs/salt-spray-chamber-guide/)󠁿 How a salt spray chamber works, the ASTM B117 and ISO 9227 standards, which industries use it and how to... [Read More](https://flexitest.in/blogs/salt-spray-chamber-guide/) [ ⌊HDPE PP Woven Sack Testing BIS Requirements and Choosing the Right UTM⌉ ](https://flexitest.in/blogs/hdpe-pp-woven-sack-testing-bis-utm-selection/) ## 󠀁[HDPE & PP Woven Sack Testing: BIS Requirements and Choosing the Right UTM](https://flexitest.in/blogs/hdpe-pp-woven-sack-testing-bis-utm-selection/)󠁿 Review BIS woven-sack requirements, fabric and seam testing, and verified Tinius Olsen 5ST and 25ST specifications for your HDPE or... [Read More](https://flexitest.in/blogs/hdpe-pp-woven-sack-testing-bis-utm-selection/) [ ⌊air permeability testing made clear⌉ ](https://flexitest.in/blogs/air-permeability-tester-fx-3300-labair-iv-guide/) ## 󠀁[Air Permeability Tester for Technical Textiles: A Complete Guide to the FX 3300 LabAir IV](https://flexitest.in/blogs/air-permeability-tester-fx-3300-labair-iv-guide/)󠁿 What air permeability is, why it matters for airbags, filters and technical textiles, how it is tested, and a close... [Read More](https://flexitest.in/blogs/air-permeability-tester-fx-3300-labair-iv-guide/) ## What is WVTR Testing? A Complete Guide for Packaging Engineers - Link: https://flexitest.in/blogs/blog-what-is-wvtr-testing-guide-packaging-engineers/ - Published: 2026-08-07T12:58:54+05:30 - Author: kamal * Complete Technical Guide Understand Water Vapour Transmission Rate, testing methods, standards, test conditions, and how to choose the right WVTR tester for your packaging application. 1. [Home](https://flexitest.in) What does WVTR mean? Why WVTR matters for packaging How WVTR testing is done Test conditions Materials tested WVTR vs OTR Choosing a WVTR tester Standards reference FAQ If you work in packaging quality control, you’ve almost certainly come across the term WVTR. A packaging film may look perfect, seal properly, and pass visual inspection-yet still allow enough moisture to reduce product shelf life. WVTR testing helps packaging engineers quantify how effectively a material resists water vapour under controlled temperature and humidity conditions. Whether you’re testing flexible films for food packaging, pharmaceutical blister packs, or industrial laminates, **Water Vapour Transmission Rate (WVTR)** is one of the most important parameters you need to measure – and understand. In this guide, we explain exactly what WVTR testing is, how it works, which test standards apply, what the numbers mean, and how to choose the right instrument for your application. * 📌 **Quick Summary** * WVTR = rate of water vapour passing through a material over time * Key standards: ASTM E96, ASTM F1249, ISO 15106-1 / 15106-2 * Critical for: food, pharma, flexible laminates, pouch manufacturing * Lower WVTR = better moisture barrier = longer shelf life * Two main methods: Gravimetric (cup) and IR / Electrolytic Sensor * Unit: g/m²/day (grams per square metre per day) ## What does WVTR mean? WVTR stands for **Water Vapour Transmission Rate**. It measures the amount of water vapour that passes through a unit area of a material in a given time under specific conditions of temperature and humidity. The standard unit for WVTR is **g/m²/day** (grams per square metre per day). A lower WVTR value means the material is a better moisture barrier. | WVTR Value | Barrier Level | Typical Application | | < 0.1 g/m²/day | Ultra-high barrier | Pharmaceutical blisters, sterile medical packaging | | 0.1 – 1.0 g/m²/day | High barrier | Snack food pouches, meat packaging, retort pouches | | 1.0 – 10 g/m²/day | Medium barrier | General flexible packaging, coffee pouches | | > 10 g/m²/day | Low barrier | Industrial wrapping films, non-food applications | **Note:** WVTR values cannot be compared directly unless the test method, temperature, relative humidity, specimen thickness, and test area are considered. ## Why does WVTR matter for packaging? Moisture is one of the primary causes of product degradation. It leads to microbial growth, oxidation, clumping of powders, loss of crispness, and reduced drug efficacy. Packaging materials are the first line of defence. * Getting the WVTR of your packaging material wrong can result in: * Shortened shelf life of food or pharmaceutical products * Failed regulatory compliance (FSSAI, FDA, EU packaging regulations) * Customer complaints and costly product recalls * Loss of brand trust and market share **WVTR testing gives you a quantifiable, reproducible measurement** that lets your packaging development team choose the right film, verify supplier quality, and demonstrate compliance to customers and regulators. ## How is WVTR testing done? There are three principal methods used globally for WVTR measurement: Method 1 - Gravimetric method (Cup method) ASTM E96 / E96M ISO 2528 IS 1060 A test specimen is sealed over a cup containing a desiccant or water. Placed in a controlled temperature and humidity environment, the cup is periodically weighed. The change in weight over time gives the WVTR. ✓ Pros Simple, low cost, no gas sensor needed. Suitable for any material thickness. ✗ Cons Slow - test cycles of 24 hours to several days. Requires high-precision balance. Method 2 - Infrared sensor method (Modulated NIR) ASTM F1249 ISO 15106-2 The film specimen separates a dry nitrogen stream from a humid air stream. Water vapour passing through the film is detected by an infrared sensor - fast and accurate for high-barrier films. ✓ Pros Fast results (hours), high sensitivity, accurate for <0.1 g/m²/day, automated. ✗ Cons Higher instrument cost. Requires appropriate calibration and periodic instrument verification. Method 3 - Electrolytic sensor (Coulometric) method ASTM F3299 ISO 15106-3 Water vapour permeating through the film is absorbed by a phosphorus pentoxide electrolytic cell, generating a measurable current. Used for ultra-high-barrier applications. Can measure WVTR as low as 0.0001 g/m²/day. ✓ Pros Ultra-high sensitivity. Essential for pharma and flexible electronics. ✗ Cons Highest instrument cost. Specialist calibration required. | Method | Best For | Speed | Sensitivity | | ⚖️ Gravimetric | General materials | 🐢 Slow | ◎ Moderate | | 📡 IR Sensor | Packaging films | ⚡ Fast | ▲ High | | ⚗️ Electrolytic | High-barrier materials | ⚡ Fast | ★ Very High | ## Test conditions - temperature and humidity WVTR values are strongly influenced by temperature and relative humidity (RH). Always report your test conditions alongside the WVTR value. | Condition | Temperature | Relative Humidity | Typical Use Case | | Example | 23°C | 50% RH | Example WVTR condition; use the temperature and humidity specified for the selected test method. | | Example | 38°C | 90% RH | Example WVTR condition; not an ICH drug-stability storage condition. | | Drug stability | 40°C | 75% RH | ICH Q1A(R2) general-case accelerated drug-stability condition; not a WVTR test requirement. | Choose the WVTR test temperature and relative humidity for your material, intended use and customer specification. Use the applicable test method and report the conditions with each result. Do not assume that 38°C/90% RH is required for every product sold in India. ## Which films and materials are tested? * WVTR testing applies to virtually any flexible barrier material: * Flexible packaging films: BOPP, PET, PE, PA (Nylon), EVOH multilayer laminates * Aluminium foil laminates and metalized films * Pharmaceutical blister foils and alu-alu laminates * Paper and paperboard with barrier coatings * Pouches and sachets (food, personal care, industrial) * Breathable membranes and technical textiles * Agricultural mulch films ### WVTR vs OTR - what's the difference? WVTR and OTR are the two most important barrier properties in flexible packaging– and they are often tested together. Many food and pharmaceutical products are sensitive to both moisture and oxygen. For example, a product may require low WVTR to prevent moisture absorption and low OTR to reduce oxidation. In such applications, evaluating both properties provides a more complete understanding of packaging barrier performance. | Parameter | WVTR | OTR | | Full name | Water Vapour Transmission Rate | Oxygen Transmission Rate | | What it measures | Moisture passing through film | Oxygen passing through film | | Unit | g/m²/day | cc/m²/day (or mL/m²/day) | | Key standard | ASTM E96, ASTM F1249, ISO 15106 | ASTM D3985, ISO 15105-2 | | Critical for | Biscuits, pharma, hygroscopic powders | Meat, coffee, cheese, chips | | Detection method | Gravimetric, IR sensor, Coulometric | Coulometric, IR sensor | Many packaging labs test both WVTR and OTR together. Multi-parameter combo instruments– like the **Labthink Combo Tester C406H** – are designed to measure both on one platform. ## WVTR testing standards - quick reference The right instrument depends on three factors: the barrier level of your material, the test standard required by your customer or regulator, and your throughput needs. ![WVTR Gravimetric Method C360H](https://flexitest.in/wp-content/uploads/2025/04/ WVTR-C360H-e1745820737992.webp "What is WVTR Testing? A Complete Guide for Packaging Engineers 37") ## General flexible packaging Method : Gravimetric Recommended Instrument : Labthink C360H [ View Details → ](https://flexitest.in/packaging-testing-equipments/permeability-testing-instruments/wvtr-gravimetric-method-c360h/) ![Oxygen Transmission Rate Tester 3 Cells - C203H](https://flexitest.in/wp-content/ uploads/2025/04/OTR-C-203H-e1745819267320.webp "What is WVTR Testing? A Complete Guide for Packaging Engineers 38") Application : High-barrier laminates, food pouches Method : Coulometric OTR (oxygen transmission; not WVTR) Related OTR Instrument : Labthink C203H [ View Details → ](https://flexitest.in/packaging-testing-equipments/permeability-testing-instruments/oxygen-transmission-rate-tester-3-cells-c203h/) ![Combo Tester 3 Cells C403H – OTR + WVTR](https://flexitest.in/wp-content/uploads/ 2025/04/Combo-C403H-OTRWVTR-e1745820994990.webp "What is WVTR Testing? A Complete Guide for Packaging Engineers 39") Application : Pharmaceutical blisters, alu-alu foil Method : Infrared WVTR Recommended Instrument : Labthink C303H [ View Details → ](https://flexitest.in/packaging-testing-equipments/permeability-testing-instruments/water-vapour-transmission-rate-tester-3-cells-c303h/) ![Combo Tester 6 Cells – C406H](https://flexitest.in/wp-content/uploads/2025/04/ Combo-C406H-e1745818853346.webp "What is WVTR Testing? A Complete Guide for Packaging Engineers 40") Application : WVTR + OTR on one unit Method : IR / Coulometric Recommended Instrument : Labthink C406H [ View Details → ](https://flexitest.in/packaging-testing-equipments/permeability-testing-instruments/combo-tester-6-cells-c406h/) Flexitest is the authorised distributor of **Labthink permeability testing instruments in India**. Our application engineers can help you select the right model for your specific films, standards, and test conditions. Looking for a testing service? See our [Barrier Testing Service page](https://flexitest.in/services/barrier-testing-service/).   ### How to choose a WVTR tester The right instrument depends on three factors: the barrier level of your material, the test standard required by your customer or regulator, and your throughput needs. ##### WVTR testing standards - quick reference ASTM E96 / E96M Gravimetric dish method - water vapour transmission of materials ASTM F1249 Modulated infrared sensor method - plastic films and sheeting ISO 15106-1 Humidity detection sensor method ISO 15106-2 Infrared detection sensor method ISO 2528 Sheet materials - water vapour transmission rate (gravimetric dish method) IS 1060 (Part 2) Indian Standard for water vapour transmission - Bureau of Indian Standards [ ⌊C306H water vapor transmission rate test system⌉ ](https://flexitest.in/packaging-testing-equipments/permeability-testing-instruments/) ### C306H WVTR Tester [ Explore ](https://flexitest.in/packaging-testing-equipments/permeability-testing-instruments/) #### Submit Your Details to Download Brochure! Name Email Phone Number Company Name Company Location By clicking the button, I agree and consent to the company’s [Privacy Policy](https://flexitest.in/privacy-policy) ## FAQ's  Frequently Asked Questions (FAQs) – Common questions from QC managers, procurement officers, and R&D teams. What is a good WVTR value for food packaging? It depends on the product. For moisture-sensitive foods like biscuits, chips, or powders, a WVTR below 1.0 g/m²/day is generally required. For products like fresh produce that need some breathability, a higher WVTR may be acceptable or even desirable. What is the difference between WVTR and MVTR? WVTR (Water Vapour Transmission Rate) and MVTR (Moisture Vapour Transmission Rate) refer to the same measurement. MVTR is an older term, still used in some medical and textile standards. Both measure the rate of water vapour passing through a material and use the same units (g/m²/day). How long does a WVTR test take? Gravimetric (cup) method tests typically take 24 to 72 hours per cycle. Modern infrared sensor instruments like the Labthink W3/230 can produce results in 2–6 hours for most packaging films, significantly reducing lab turnaround time. Can WVTR be tested on pouches and finished packaging? Standard WVTR tests are performed on flat film specimens. For finished pouches, the whole-package transmission rate can be determined using a headspace or sealed- pouch method – a different but related measurement. For most QC and supplier qualification purposes, flat film testing is standard practice. Is WVTR testing required for export packaging? Whether you need WVTR data depends on the product, customer specification and relevant market requirements. ICH Q1A(R2) covers drug-substance and drug-product stability, not a universal WVTR test condition for packaging films. Confirm the required test method and conditions before commissioning a test. Need a WVTR tester for your lab? Flexitest supplies Labthink permeability testing instruments across India  gravimetric, IR sensor, electrolytic, and combo models. ## NABL-traceable calibration ## Free installation & demo ## 24/7 online support [ Explore Permeability Testing Instruments ](https://flexitest.in/blogs/blog-what-is-wvtr-testing-guide-packaging-engineers/#elementor-action%3Aaction%3Dpopup%3Aopen%26settings%3DeyJpZCI6IjU1ODE5IiwidG9nZ2xlIjpmYWxzZX0%3D) or email[info@flexitest.in ](https://flexitest.in/blogs/blog-what-is-wvtr-testing-guide-packaging-engineers/info@flexitest.in)· www.flexitest.in ## Recent Post ## 󠀁[IS 11652 UV Weathering Test for Cement Sacks](https://flexitest.in/blogs/is-11652-uv-weathering-test-cement-sacks/)󠁿 BIS certification under IS 11652 is mandatory for 50 kg cement sacks from 6 October 2026. See what the UV... 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[Read More](https://flexitest.in/blogs/hdpe-pp-woven-sack-testing-bis-utm-selection/) [ ⌊air permeability testing made clear⌉ ](https://flexitest.in/blogs/air-permeability-tester-fx-3300-labair-iv-guide/) ## 󠀁[Air Permeability Tester for Technical Textiles: A Complete Guide to the FX 3300 LabAir IV](https://flexitest.in/blogs/air-permeability-tester-fx-3300-labair-iv-guide/)󠁿 What air permeability is, why it matters for airbags, filters and technical textiles, how it is tested, and a close... [Read More](https://flexitest.in/blogs/air-permeability-tester-fx-3300-labair-iv-guide/) ##  Capillary Flow Porometry: A Complete Guide to How It Works, Methods & Applications - Link: https://flexitest.in/blogs/capillary-flow-porometry-a-complete-guide-to-how-it-works-methods-applications/ - Published: 2026-05-15T11:23:05+05:30 - Author: kamal * Complete Technical Guide 1. [Home](https://flexitest.in) In filtration, membrane manufacturing, and porous material development, understanding the precise pore structure of a material is critical. **Capillary flow porometry** is one of the most reliable and widely adopted techniques for measuring **pore size and pore size distribution** in porous media. From polymeric membranes to ceramic filters, this technique helps manufacturers validate product quality, optimise performance, and meet stringent industry specifications. ## 01. What is capillary flow porometry? Capillary flow porometry is a non-destructive characterisation technique used to measure the through pores of porous materials. It determines pore size by displacing a wetting liquid from the pores of a sample using pressurised gas – or another liquid. This method is uniquely valuable because it measures only through pores – the continuous channels that connect one side of a material to the other. This makes it the most relevant technique for filtration media, membranes, and barrier materials where flow performance matters. Gas-liquid porometry covers pore sizes from 500 µm down to 13 nm, while liquid-liquid porometry extends into the nanofiltration range down to 2 nm – making capillary flow porometry one of the widest-range pore characterisation techniques available. ## 02. How does capillary flow porometry work? A capillary flow porometer measures the gas pressure required to empty pores of a given size. At the same time, it records the gas flow rate as a function of applied pressure. From this data, two curves are generated: P = (4γ cosθ) / D P= applied pressure γ = surface tension of the wetting liquid θ= contact angle between liquid and pore wall D= pore diameter ![capillary flow porometry](https://flexitest.in/wp-content/uploads/2026/05/Porometer_Blog. webp " Capillary Flow Porometry: A Complete Guide to How It Works, Methods & Applications 45") ## Key parameters measured Capillary flow porometry provides several critical parameters used in product validation, quality control, and R&D: ## **Bubble point pore size**⏎ The largest through pore in the material ## **Mean flow pore size**⏎ Most representative pore size of the material ## **Smallest pore size**⏎ Smallest detectable through pore ## **Cumulative distribution **⏎ Cumulative pore size distribution across the range ## **Differential distribution **⏎ Differential pore size distribution profile ## **Air permeability **⏎ Gas flow rate through the dry sample ### Technique comparison at a glance ## 03. Applications: where capillary flow porometry is used Capillary flow porometry is used across many industries that rely on porous materials. Common sample types include: * Polymeric membranes – flat sheet and hollow fiber * Nonwovens and technical textiles * Ceramic membranes and tubes * Porous metal discs and metal fiber media * Specialty filtration papers * Any other filter media containing through pores ### Industries using capillary flow porometry ## 04. Why pore size distribution matters Two materials with the same average pore size can perform very differently if their** pore size distributions** differ. A narrow distribution indicates a uniform structure and reliable filtration efficiency. A wide distribution can mean inconsistent performance, premature failure, or contamination breakthrough. By accurately characterising pore size distribution, capillary flow porometry helps: * **R&D teams** – design better materials with tighter structural control * **QA/QC teams** – catch defects before products ship * **Production teams** – maintain batch-to-batch consistency * **End users** – select the right media for the right application ## 05. Advantages of capillary flow porometry Capillary flow porometry offers several distinct advantages over techniques such as mercury intrusion porosimetry: * Measures only** functional through** pores that contribute to flow performance * **Mercury-free **- no toxic reagents required * **Fast, automated, and reproducible **- suited to both R&D and routine QC * **Non-destructive **- the same sample can be reused or archived after testing * **Wide measurement range **spanning multiple material classes * **ISO and ASTM compliant** - results traceable to international standards ## 06. Choosing the right porometer Modern capillary flow porometers are fully automated and user-friendly. When evaluating a porometer for your lab, look for: * **Wide pressure and flow range **to cover your full material spectrum * **High-resolution sensors** for nanoscale accuracy * **Real-time software monitoring **with data export capability * **Support for both GLP and LLP** porometry modes * **Compliance with ASTM and ISO** international testing standards At Flexitest in partnership with our OEM [Porometer](https://www.porometer.com/), we supply advanced capillary flow porometers across India with full application consultation, installation, and ongoing support. ## 07. Conclusion Capillary flow porometry is an indispensable tool for any organisation working with porous materials. By accurately measuring **bubble point, mean flow pore size, pore size distribution, and air permeability , it enables manufacturers to validate product quality and meet the most demanding industry requirements. Whether you are developing nanofiltration membranes, ensuring consistency of technical textiles, or qualifying ceramic filters – capillary flow porometrydelivers the reliable, repeatable data you need. What is the difference between capillary flow porometry and mercury porosimetry? + Capillary flow porometry measures only through pores using a wetting liquid and gas, while mercury porosimetry measures all pores by intruding mercury under high pressure. Porometry is non-destructive and mercury-free. What is the bubble point in capillary flow porometry? + The bubble point is the pressure at which gas first flows through the largest pore of a wetted sample. It corresponds to the largest through pore size in the material and is the first critical data point generated during a gas-liquid porometry measurement. Can capillary flow porometry measure nanopores? + Yes. Gas-liquid porometry can measure pores down to approximately 13 nm, while liquid- liquid porometry can measure pores as small as 2 nm. The correct liquid pair must be selected based on your target pore size range. Which industries use capillary flow porometry? + Industries include filtration, membrane manufacturing, biotechnology, pharmaceuticals, automotive, energy, water treatment, electronics, aerospace, and technical textiles. Is capillary flow porometry a destructive test? + No. It is a non-destructive technique - the sample can typically be dried and reused after testing. This makes it ideal for testing valuable or limited samples in R& D environments. [ ⌊POROLUX capillary flow porometer⌉ ](https://flexitest.in/packaging-testing-equipments/permeability-testing-instruments/wvtr-gravimetric-method-c360h/) ## 󠀁[Capillary Flow Porometer ](https://flexitest.in/technical-textiles/capillary-flow-porometer/)󠁿 [ Explore ](https://flexitest.in/technical-textiles/capillary-flow-porometer/) #### Submit Your Details to Download Brochure! Name Email Phone Number Company Name Company Location By clicking the button, I agree and consent to the company’s [Privacy Policy](https://flexitest.in/privacy-policy) ## Recent Post ## 󠀁[IS 11652 UV Weathering Test for Cement Sacks](https://flexitest.in/blogs/is-11652-uv-weathering-test-cement-sacks/)󠁿 BIS certification under IS 11652 is mandatory for 50 kg cement sacks from 6 October 2026. See what the UV... 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