Chemraz 615 vs Isolast J9504 Comparison

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Reviewed by MLC Editorial Team | 7 June 2026

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Chemraz 615 and Isolast J9504 are both perfluoroelastomer (FFKM) compounds used in chemical, refinery, and process applications. Chemraz 615 vs Isolast J9504 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	Chemraz 615	Isolast J9504
Manufacturer	Greene Tweed	Trelleborg Sealing Solutions
Compound	615	J9504
Maximum continuous temp	324°C	270°C
Minimum temp	-10°C	-10°C
Hardness	75 Shore A	75 Shore A
Colour	Black	Black
Typical applications	Refinery, chemical, hot amines, steam	Refinery, chemical, hot service

When to specify Chemraz 615

Chemraz 615 suits refinery and similar service. Continuous temperature window is -10°C to 324°C, hardness 75 Shore A. Manufactured by Greene Tweed.

When to specify Isolast J9504

Isolast J9504 suits refinery and similar service. Continuous temperature window is -10°C to 270°C, hardness 75 Shore A. Manufactured by Trelleborg Sealing Solutions.

Key differences

Temperature ceiling: Chemraz 615 runs 54°C hotter (324°C vs 270°C). Specify the higher-rated compound when continuous service is above 270°C.
Hardness: Both are 75 Shore A, so groove design and squeeze percentage are interchangeable.
Manufacturer: Chemraz 615 is from Greene Tweed; Isolast J9504 is from Trelleborg Sealing Solutions. 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

Get a quote for Chemraz 615 vs Isolast J9504 Comparison

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Related pages

References

Greene Tweed - Chemraz 615
Trelleborg Sealing Solutions - Isolast J9504
BS 1806
ISO 3601

Frequently Asked Questions

Can I substitute Chemraz 615 for Isolast J9504?

Yes, Chemraz 615 and Isolast J9504 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: Chemraz 615 or Isolast J9504?

Chemraz 615 has a higher continuous temperature ceiling (324°C vs 270°C, a 54°C difference).

Which costs less: Chemraz 615 or Isolast J9504?

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 Chemraz 615 or Isolast J9504 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.

Independent UK engineering trade publication. Company profiles cross-referenced with Companies House.

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