Heat Seal & Hot Tack Testers for Flexible Packaging
Heat Sealability vs Hot Tack: Choose the Right Test
Choose the test around the point where your seal problem occurs. Use the C630H to develop repeatable sealing conditions. Use the C632M to measure how a fresh seal performs before it cools.
On a phone, swipe across the table to compare both models.
| Compare by | C630H Heat Seal Tester | C632M Hot Tack Tester |
|---|---|---|
| Choose it when | You need to find repeatable sealing conditions for a film or laminate. | You need to know whether a fresh seal will hold during filling and transfer. |
| What it does | Creates controlled laboratory seals by setting temperature, pressure and dwell time. Use a separate tensile or seal-strength tester for cooled seal strength. | Creates the seal, waits for the programmed delay and measures hot-tack force with a 50 N load cell. |
| Key settings | Room temperature–300°C; 0.1–0.7 MPa; 0.1–999.99 s dwell. | Room temperature–250°C; 0.05–0.7 MPa; 0.1–999.9 s dwell; 0.01–999.99 s delay. |
| Test setup | Five independently temperature-controlled upper and lower jaw groups help you prepare and compare seals efficiently. | One double-heated jaw set with automatic sample feeding and pneumatic clamping. |
| Typical use | Film development, supplier or batch qualification, sealing-window studies and sample preparation. | Film selection and troubleshooting when seals open during VFFS/HFFS filling, dropping or conveyor transfer. |
| Materials | Plastic and composite films, coated paper, coextruded and aluminized films, foil composites, patterned films and flexible plastic tubes. | Plastic films, sheets and composites, including PE-, PP- and PET-based packaging films. |
| Test standards | ASTM F2029, QB/T 2358 and YBB 00122003. | ASTM F1921 and GB/T 34445. |
Start with your test goal, material and failure point. If you are unsure, share them with us and we’ll help you choose.
C630H Heat Seal Tester for Flexible Packaging
Develop reliable sealing conditions before a film or laminate reaches production. The Labthink C630H lets product-development and quality-control teams prepare up to five groups of laboratory seals with independently controlled jaw temperatures, making it easier to compare temperature, pressure and dwell-time settings.
Use it for material development, supplier or batch qualification and sealing-window studies. When you need cooled seal-strength results, test the prepared specimens separately on a suitable tensile or seal-strength tester.
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C630H Applications & Key Features
- Prepare up to five groups of seals in one run, with independent temperature control for every upper and lower jaw pair.
- Adjust sealing temperature, pressure and dwell time to find a repeatable sealing window.
- Operating range: room temperature–300°C, 0.1–0.7 MPa and 0.1–999.99 s dwell time.
- Suitable for plastic and composite films, coated paper, coextruded and aluminized films, foil composites, patterned films and flexible plastic tubes.
- Supports ASTM F2029, QB/T 2358 and YBB 00122003 methods listed by Labthink.
- Optional PC software supports remote operation, data saving, export and printing.
C630H Heat Seal Tester: Key Specifications
Review the key operating ranges for creating repeatable laboratory seals and comparing sealing conditions.
| Sealing temperature | Room temperature–300°C |
|---|---|
| Sealing pressure | 0.1–0.7 MPa |
| Pressure resolution | 0.001 MPa |
| Dwell time | 0.1–999.99 s |
| Temperature resolution | 0.1°C |
| Temperature fluctuation | ±0.2°C |
| Temperature accuracy | ±0.5°C (single-point calibration) |
| Temperature gradient | ≤20°C |
| Gas supply pressure | 0.7 MPa (external supply required) |
| Port connection | Φ8 mm PU tubing |
| Sealing area | 40 × 10 mm |
Measuring strength after the seal cools? The C630H prepares the specimens. Test their cooled seal strength separately on a compatible tensile or seal-strength tester.
We’ll confirm the latest configuration, sample compatibility and required accessories with your quotation.
C632M Hot Tack Tester for FFS Packaging Films
Find out whether a fresh seal can withstand filling and transfer before it cools. The Labthink C632M creates the seal, waits for a programmed delay and measures hot-tack force with a 50 N load cell.
Use it for film selection, supplier or batch qualification and troubleshooting seals that open during filling, dropping or conveyor transfer on vertical or horizontal form-fill-seal lines. Labthink lists ASTM F1921 and GB/T 34445 for this model.
Submit Your Details to Download Brochure!
C632M Applications & Key Features
- Set the sealing pressure and temperature, then feed the specimen automatically for a repeatable test sequence.
- A protective cover, observation window, preload fixtures and pneumatic clamping support safe, consistent sample handling.
- A 7-inch touchscreen, AC servo drive, automatic data saving and over-limit warnings simplify routine operation.
- Suitable for PE-, PP- and PET-based films, sheets and composites; supports ASTM F1921 and GB/T 34445 methods listed by Labthink.
C632M Hot Tack Tester: Key Specifications
Review the key measurement and operating ranges for checking seal strength immediately after sealing.
| Load-cell capacity | 50 N |
|---|---|
| Force accuracy | Grade 0.5 |
| Force resolution | 0.001 N |
| Sealing pressure | 0.05–0.7 MPa |
| Pressure resolution | 0.001 MPa |
| Temperature fluctuation | ±0.2°C |
| Test speed | 1500 mm/min; 2000–12000 mm/min |
| Heat-seal dwell time | 0.1–999.9 s |
| Sealing-jaw size | 100 × 10 mm |
| Fixture width | 35 mm |
| Specimen width | 15, 25 or 25.4 mm |
Testing a seal before it cools? The C632M combines controlled sealing, a programmed delay and hot-tack force measurement in one test sequence.
We’ll confirm the latest configuration, sample compatibility and required accessories with your quotation.
Frequently Asked Questions
Heat seal and hot tack tester selection for flexible packaging.
What is the difference between heat-seal and hot-tack testing?
Heat-seal testing helps you find the temperature, pressure and dwell time needed to make a consistent seal. Hot-tack testing checks how strong that seal is immediately after it forms, before it cools.
Does the C630H measure seal strength?
No. The C630H creates controlled seal samples. Once the samples have cooled, measure their seal strength on a suitable tensile or seal-strength tester. If you need force measurement before the seal cools, consider the C632M.
Which tester is better for a high-speed form-fill-seal line?
Choose the C632M when seals open during filling, dropping or transfer before they cool. Choose the C630H when you need to establish a stable temperature-pressure-dwell sealing window. Some development projects use both.
Do I need the C630H, C632M or both?
Choose the C630H to create repeatable laboratory seals and establish sealing conditions. Choose the C632M to measure hot-tack force before the seal cools. Use both when you need to study seal formation as well as fresh-seal performance.
What materials can I test?
C630H applications include plastic and composite films, coated paper, coextruded and aluminized films, foil composites, patterned films and flexible plastic tubes. C632M applications include plastic films, sheets and composites such as PE-, PP- and PET-based packaging films.
Which test standards are relevant to the C630H Heat Seal Tester?
Labthink lists ASTM F2029, QB/T 2358 and YBB 00122003 for the C630H. ASTM F2029 covers making controlled laboratory heat seals to evaluate heat sealability; seal strength is measured separately on suitable tensile or seal-strength equipment. Share your material and target standard, and we’ll help confirm the right test setup.
Which test standards are relevant to the C632M Hot Tack Tester?
Labthink lists ASTM F1921 and GB/T 34445 for the C632M. These methods are relevant to hot-tack performance—how much force a freshly made seal can withstand before it cools. Share your film structure and packaging-line conditions, and we’ll help confirm the appropriate method and settings.
What does each tester control and measure?
The C630H controls sealing temperature, pressure and dwell time to prepare repeatable seal samples. The C632M also controls the delay and test speed, then measures hot-tack force with a 50 N load cell.
What should I send for a test recommendation?
Share your film or laminate structure, sealant layer, pack type, current sealing settings, line speed and the point where the seal fails. Include the required test standard if you already know it.
