Simriz SZ487 FFKM O-Ring: Compound, Equivalents, UK Suppliers
Verified by Rachel Mayfield, Supply Chain Analyst - April 2026
Simriz SZ487 is a 75 Shore A perfluoroelastomer (FFKM) manufactured by Freudenberg-NOK. It seals continuously to 300°C and is specified for aggressive acids/bases/solvents and similar service. Thermal/chemical FFKM marketed as direct Kalrez 4079 alternative.
Specifications
| Property | Value |
|---|---|
| Compound | SZ487 |
| Manufacturer | Freudenberg-NOK |
| Maximum continuous temperature | 300°C |
| Minimum temperature | -10°C |
| Hardness | 75 Shore A |
| Colour | Black |
| Material family | Thermal/chemical FFKM marketed as direct Kalrez 4079 alternative |
Where Simriz SZ487 is used
Simriz SZ487 is specified for: Aggressive acids/bases/solvents, refinery, chemical process.
Simriz SZ487 equivalents from other FFKM manufacturers
If Simriz SZ487 isn't available, these compounds from competing manufacturers have similar chemistry and operating windows. Always verify against your actual fluid and temperature before substitution.
| Equivalent compound | Manufacturer | Max temp | Hardness | Direct match |
|---|---|---|---|---|
| Kalrez 4079 | DuPont (Chemours) | 316°C | 75 Shore A | ✓ |
| Chemraz 615 | Greene Tweed | 324°C | 75 Shore A | ✓ |
Available O-ring sizes
Simriz SZ487 is supplied in:
- BS 1806 sizes: BS001 to BS932 (UK / EU standard, imperial-origin metric)
- AS568 sizes: -001 to -932 (US standard, dimensionally identical to BS 1806)
- ISO 3601 sizes: metric IDs from 2 mm to 670 mm with cross-sections 1.0 mm to 7.0 mm
- JIS B 2401: P, G, S series (Japanese OEM equipment)
- Custom / non-standard: built-to-print for OEM applications
For a list of sizes commonly stocked in the UK, see the BS 1806 size chart, ISO 3601 metric chart, or contact a UK seal specialist below.
UK availability
Simriz SZ487 is supplied in the UK by FFKM specialists carrying multiple manufacturer lines. Lead time is typically 2-5 working days for stock sizes, 4-8 weeks for custom-moulded sizes. Use the form below to get a quote from a UK FFKM specialist.
References
- Freudenberg-NOK — Manufacturer
- ISO 3601 O-ring sizes
- BS 1806
Frequently Asked Questions
What is Simriz SZ487 used for?
Simriz SZ487 is a 75 Shore A FFKM (perfluoroelastomer) compound from Freudenberg-NOK. It is used in Aggressive acids/bases/solvents, refinery, chemical process. Continuous service temperature: -10°C to 300°C.
What is the temperature rating of Simriz SZ487?
Simriz SZ487 has a continuous service temperature range of -10°C to 300°C. Short-term excursions above the maximum are possible but degrade service life.
What is the equivalent of Simriz SZ487?
Direct equivalents to Simriz SZ487 include: Kalrez 4079, Chemraz 615. Always confirm chemical compatibility against your specific fluid before substitution.
How much does Simriz SZ487 cost?
FFKM O-rings such as Simriz SZ487 are typically £30 to £500 per piece depending on size, with custom or large-bore parts at the upper end. Get a current quote via the form on this page.
Where can I buy Simriz SZ487 in the UK?
Simriz SZ487 is supplied in the UK by independent FFKM seal specialists with multi-brand inventory. Lead time is 2-5 working days for stock BS/AS568 sizes, 4-8 weeks for custom-moulded sizes.
References
- Freudenberg-NOK — Manufacturer
- ISO 3601 O-ring sizes
- BS 1806