Verified by Rachel Mayfield, Supply Chain Analyst - April 2026
Chemraz 505 is a 75 Shore A perfluoroelastomer (FFKM) manufactured by Greene Tweed. It seals continuously to 230°C and is specified for aerospace and similar service. Cold-flexible FFKM (lowest min temp in Chemraz line).
Specifications
| Property | Value |
|---|
| Compound | 505 |
| Manufacturer | Greene Tweed |
| Maximum continuous temperature | 230°C |
| Minimum temperature | -34°C |
| Hardness | 75 Shore A |
| Colour | Black |
| Material family | Cold-flexible FFKM (lowest min temp in Chemraz line) |
Where Chemraz 505 is used
Chemraz 505 is specified for: Aerospace, refrigeration, cold chemical service.
Chemraz 505 equivalents from other FFKM manufacturers
If Chemraz 505 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 0040 | DuPont (Chemours) | 250°C | 70 Shore A | ✓ |
Available O-ring sizes
Chemraz 505 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
Chemraz 505 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.