Kalrez 9100 vs Simriz SZ498: FFKM Compound Comparison
Verified by Rachel Mayfield, Supply Chain Analyst - April 2026
Kalrez 9100 and Simriz SZ498 are both perfluoroelastomer (FFKM) compounds used in chemical, refinery, and process applications. Kalrez 9100 vs Simriz SZ498 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 9100 | Simriz SZ498 |
|---|---|---|
| Manufacturer | DuPont (Chemours) | Freudenberg-NOK |
| Compound | 9100 | SZ498 |
| Maximum continuous temp | 327°C | 327°C |
| Minimum temp | 0°C | 0°C |
| Hardness | 90 Shore A | 90 Shore A |
| Colour | Black | Black |
| Typical applications | Oil and gas, RGD (rapid gas decompression) resistant | Oil and gas, RGD |
When to specify Kalrez 9100
Kalrez 9100 suits oil and gas and similar service. Continuous temperature window is 0°C to 327°C, hardness 90 Shore A. Manufactured by DuPont (Chemours).
When to specify Simriz SZ498
Simriz SZ498 suits oil and gas and similar service. Continuous temperature window is 0°C to 327°C, hardness 90 Shore A. Manufactured by Freudenberg-NOK.
Key differences
- Temperature ceiling: Simriz SZ498 runs 0°C hotter (327°C vs 327°C). Specify the higher-rated compound when continuous service is above 327°C.
- Hardness: Both are 90 Shore A, so groove design and squeeze percentage are interchangeable.
- Manufacturer: Kalrez 9100 is from DuPont (Chemours); Simriz SZ498 is from Freudenberg-NOK. 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 9100 for Simriz SZ498?
Yes, Kalrez 9100 and Simriz SZ498 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 9100 or Simriz SZ498?
Simriz SZ498 has a higher continuous temperature ceiling (327°C vs 327°C, a 0°C difference).
Which costs less: Kalrez 9100 or Simriz SZ498?
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 9100 or Simriz SZ498 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.