Simriz SZ498 FFKM O-Ring Specs UK Suppliers

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Reviewed by MLC Editorial Team | 26 July 2026

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Simriz SZ498 is a 90 Shore A perfluoroelastomer (FFKM) manufactured by Freudenberg-NOK. It seals continuously to 327°C and is specified for oil and gas and similar service. Hardest Simriz, RGD-rated.

Specifications

Property	Value
Compound	SZ498
Manufacturer	Freudenberg-NOK
Maximum continuous temperature	327°C
Minimum temperature	0°C
Hardness	90 Shore A
Colour	Black
Material family	Hardest Simriz, RGD-rated

Where Simriz SZ498 is used

Simriz SZ498 is specified for: Oil and gas, RGD.

Simriz SZ498 equivalents from other FFKM manufacturers

If Simriz SZ498 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 9100	DuPont (Chemours)	327°C	90 Shore A	✓

Available O-ring sizes

Simriz SZ498 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 SZ498 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.

Get a quote for Simriz SZ498 FFKM O-Ring Specs UK Suppliers

Acumen Seals & Pumps - UK specialist in mechanical seals, FFKM O-rings, Kalrez compounds, and elastomer parts. 36 years of inventory, UK stock with 24-48 hour despatch, and a price back within 4 working hours.

Send an enquiry via the MLC contact form

References

Freudenberg-NOK - Manufacturer
ISO 3601 O-ring sizes
BS 1806

Frequently Asked Questions

What is Simriz SZ498 used for?

Simriz SZ498 is a 90 Shore A FFKM (perfluoroelastomer) compound from Freudenberg-NOK. It is used in Oil and gas, RGD. Continuous service temperature: 0°C to 327°C.

What is the temperature rating of Simriz SZ498?

Simriz SZ498 has a continuous service temperature range of 0°C to 327°C. Short-term excursions above the maximum are possible but degrade service life.

What is the equivalent of Simriz SZ498?

Direct equivalents to Simriz SZ498 include: Kalrez 9100. Always confirm chemical compatibility against your specific fluid before substitution.

How much does Simriz SZ498 cost?

FFKM O-rings such as Simriz SZ498 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 SZ498 in the UK?

Simriz SZ498 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.

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

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Get a UK price for Simriz SZ498 FFKM O-Ring Specs UK Suppliers

Andrew Sykes at Acumen Seals & Pumps — 36 years in sealing. UK stock with 24–48 hour despatch, and a price back within 4 working hours. OEM and production-run enquiries welcome, from a single seal to scheduled supply of thousands of parts.

Your enquiry goes straight to Acumen Seals & Pumps in the UK. No obligation, and we never pass your details to anyone else.