# 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 1")

[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 creates a controlled, highly corrosive salt fog, so coatings
and materials that would take years to fail outdoors show their weaknesses in hours
or weeks.

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.

Waiting years for outdoor exposure results is not practical for a production line.
A salt spray chamber solves this by creating a controlled, highly corrosive salt
fog that speeds up corrosion. Coatings and materials that would take years to fail
outdoors show weaknesses in hours or weeks inside the chamber.

## 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
2")

The same metal panel before and after a salt spray test: corrosion that outdoor 
exposure would take years to produce appears inside the chamber in hours or weeks.

## 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, approve new suppliers and prove coating life to customers. 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 6")

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(
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