Verified by Rachel Mayfield, Supply Chain Analyst - April 2026
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.