Chemraz 615 vs Simriz SZ487 Comparison

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Chemraz 615 vs Simriz SZ487 Comparison

Reviewed by MLC Editorial Team | 7 June 2026

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Chemraz 615 and Simriz SZ487 are both perfluoroelastomer (FFKM) compounds used in chemical, refinery, and process applications. Chemraz 615 vs Simriz SZ487 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	Simriz SZ487
Manufacturer	Greene Tweed	Freudenberg-NOK
Compound	615	SZ487
Maximum continuous temp	324°C	300°C
Minimum temp	-10°C	-10°C
Hardness	75 Shore A	75 Shore A
Colour	Black	Black
Typical applications	Refinery, chemical, hot amines, steam	Aggressive acids/bases/solvents, refinery, chemical process

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 Simriz SZ487

Simriz SZ487 suits aggressive acids/bases/solvents and similar service. Continuous temperature window is -10°C to 300°C, hardness 75 Shore A. Manufactured by Freudenberg-NOK.

Key differences

Temperature ceiling: Chemraz 615 runs 24°C hotter (324°C vs 300°C). Specify the higher-rated compound when continuous service is above 300°C.
Hardness: Both are 75 Shore A, so groove design and squeeze percentage are interchangeable.
Manufacturer: Chemraz 615 is from Greene Tweed; Simriz SZ487 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

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Related pages

References

Greene Tweed - Chemraz 615
Freudenberg-NOK - Simriz SZ487
BS 1806
ISO 3601

Frequently Asked Questions

Can I substitute Chemraz 615 for Simriz SZ487?

Yes, Chemraz 615 and Simriz SZ487 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 Simriz SZ487?

Chemraz 615 has a higher continuous temperature ceiling (324°C vs 300°C, a 24°C difference).

Which costs less: Chemraz 615 or Simriz SZ487?

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 Simriz SZ487 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.

References

Greene Tweed — Chemraz 615
Freudenberg-NOK — Simriz SZ487
BS 1806
ISO 3601

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

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