Kalrez 0040 FFKM O-Ring Specs UK Suppliers

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Reviewed by MLC Editorial Team | 26 July 2026

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Kalrez 0040 is a 70 Shore A perfluoroelastomer (FFKM) manufactured by DuPont (Chemours). It seals continuously to 250°C and is specified for aerospace fuels and similar service. Low-temp-capable FFKM.

Specifications

Property	Value
Compound	0040
Manufacturer	DuPont (Chemours)
Maximum continuous temperature	250°C
Minimum temperature	-25°C
Hardness	70 Shore A
Colour	Black
Material family	Low-temp-capable FFKM

Where Kalrez 0040 is used

Kalrez 0040 is specified for: Aerospace fuels, low-temp chemical service.

Kalrez 0040 equivalents from other FFKM manufacturers

If Kalrez 0040 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
Chemraz 505	Greene Tweed	230°C	75 Shore A	✓

Available O-ring sizes

Kalrez 0040 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

Kalrez 0040 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 Kalrez 0040 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

DuPont (Chemours) - Manufacturer
ISO 3601 O-ring sizes
BS 1806

Frequently Asked Questions

What is Kalrez 0040 used for?

Kalrez 0040 is a 70 Shore A FFKM (perfluoroelastomer) compound from DuPont (Chemours). It is used in Aerospace fuels, low-temp chemical service. Continuous service temperature: -25°C to 250°C.

What is the temperature rating of Kalrez 0040?

Kalrez 0040 has a continuous service temperature range of -25°C to 250°C. Short-term excursions above the maximum are possible but degrade service life.

What is the equivalent of Kalrez 0040?

Direct equivalents to Kalrez 0040 include: Chemraz 505. Always confirm chemical compatibility against your specific fluid before substitution.

How much does Kalrez 0040 cost?

FFKM O-rings such as Kalrez 0040 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 Kalrez 0040 in the UK?

Kalrez 0040 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 Kalrez 0040 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.