Perlast G90A FFKM O-Ring: Compound, Equivalents, UK Suppliers
Verified by Rachel Mayfield, Supply Chain Analyst - April 2026
Perlast G90A is a 90 Shore A perfluoroelastomer (FFKM) manufactured by Precision Polymer Engineering. It seals continuously to 270°C and is specified for oil and gas valves and similar service. Hard FFKM for high-pressure.
Specifications
| Property | Value |
|---|---|
| Compound | G90A |
| Manufacturer | Precision Polymer Engineering |
| Maximum continuous temperature | 270°C |
| Minimum temperature | 0°C |
| Hardness | 90 Shore A |
| Colour | Black |
| Material family | Hard FFKM for high-pressure |
Where Perlast G90A is used
Perlast G90A is specified for: Oil and gas valves, RGD service.
Perlast G90A equivalents from other FFKM manufacturers
If Perlast G90A 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 8475 | DuPont (Chemours) | 325°C | 90 Shore A | approx |
| Chemraz 633 | Greene Tweed | 327°C | 90 Shore A | approx |
Available O-ring sizes
Perlast G90A 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
Perlast G90A 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
- Precision Polymer Engineering — Manufacturer
- ISO 3601 O-ring sizes
- BS 1806
Frequently Asked Questions
What is Perlast G90A used for?
Perlast G90A is a 90 Shore A FFKM (perfluoroelastomer) compound from Precision Polymer Engineering. It is used in Oil and gas valves, RGD service. Continuous service temperature: 0°C to 270°C.
What is the temperature rating of Perlast G90A?
Perlast G90A has a continuous service temperature range of 0°C to 270°C. Short-term excursions above the maximum are possible but degrade service life.
What is the equivalent of Perlast G90A?
Direct equivalents to Perlast G90A include: Kalrez 8475, Chemraz 633. Always confirm chemical compatibility against your specific fluid before substitution.
How much does Perlast G90A cost?
FFKM O-rings such as Perlast G90A 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 Perlast G90A in the UK?
Perlast G90A 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
- Precision Polymer Engineering — Manufacturer
- ISO 3601 O-ring sizes
- BS 1806