Kalrez 6375 vs Perlast G80A: FFKM Compound Comparison
Verified by Rachel Mayfield, Supply Chain Analyst - April 2026
Kalrez 6375 and Perlast G80A are both perfluoroelastomer (FFKM) compounds used in chemical, refinery, and process applications. Kalrez 6375 vs Perlast G80A They share similar chemistry but differ on temperature ceiling, hardness, and intended service. This page compares the two side-by-side and explains when to specify each.
Side-by-side comparison
| Property | Kalrez 6375 | Perlast G80A |
|---|---|---|
| Manufacturer | DuPont (Chemours) | Precision Polymer Engineering |
| Compound | 6375 | G80A |
| Maximum continuous temp | 275°C | 260°C |
| Minimum temp | -7°C | -15°C |
| Hardness | 75 Shore A | 80 Shore A |
| Colour | Black | Black |
| Typical applications | Chemical process, pharmaceutical, semiconductor wet etch, hot/cold cycling | General chemical process |
When to specify Kalrez 6375
Kalrez 6375 suits chemical process and similar service. Continuous temperature window is -7°C to 275°C, hardness 75 Shore A. Manufactured by DuPont (Chemours).
Limitation: Lower temp ceiling than 4079; not for high-purity semiconductor plasma.
When to specify Perlast G80A
Perlast G80A suits general chemical process and similar service. Continuous temperature window is -15°C to 260°C, hardness 80 Shore A. Manufactured by Precision Polymer Engineering.
Key differences
- Temperature ceiling: Kalrez 6375 runs 15°C hotter (275°C vs 260°C). Specify the higher-rated compound when continuous service is above 260°C.
- Hardness: Kalrez 6375 is 75 Shore A; Perlast G80A is 80 Shore A. Harder compounds resist extrusion at high pressure but seal less compliantly on imperfect surfaces.
- Manufacturer: Kalrez 6375 is from DuPont (Chemours); Perlast G80A is from Precision Polymer Engineering. Lead time and UK availability vary by brand.
- Cost: FFKM pricing varies by manufacturer, batch size, and stock position. Both compounds are at the premium end of elastomer pricing (£30 to £500+ per O-ring depending on size).
Get a UK quote on either compound
Related pages
Frequently Asked Questions
Can I substitute Kalrez 6375 for Perlast G80A?
Yes, Kalrez 6375 and Perlast G80A are both FFKM compounds with overlapping chemical compatibility. Verify your specific fluid against both manufacturers' compatibility tables before substitution. Temperature window, hardness, and certifications may differ.
Which is hotter: Kalrez 6375 or Perlast G80A?
Kalrez 6375 has a higher continuous temperature ceiling (275°C vs 260°C, a 15°C difference).
Which costs less: Kalrez 6375 or Perlast G80A?
FFKM compound pricing depends on manufacturer, batch size, certifications, and current stock position rather than headline brand. Both compounds are at the premium end of elastomer pricing. Get current UK quotes on both before specifying.
Where can I buy Kalrez 6375 or Perlast G80A in the UK?
Both compounds are supplied in the UK by independent FFKM seal specialists carrying multiple manufacturer lines. Lead time is typically 2-5 working days for stock BS 1806 / AS568 sizes, 4-8 weeks for custom-moulded sizes.