Engineered for extremes
FKM General 75B
Read the code: FKM, GEN duty (general reference grade), 75 Shore A, B for bisphenol cure, recipe 01.
Development grade. The values below are design targets, not measured results. Each target becomes a typical value, with the number of lots and the test report behind it, as testing is completed.
A 75 Shore A bisphenol-cured FKM for general O-ring and seal duty in oils, fuels and hydrocarbons to 200 °C. Low compression set and a stable lot-to-lot record make it the base of a seal maker's catalogue.
- Polymer class
- FKM
- Duty
- GEN: general reference grade
- Hardness
- 75 Shore A
- Temperature range
- -20 to 200 °C
- Lead time
- Trial quantities on request
- Minimum order
- 25 kg
- Issued
- 2026-10-28
- Revision
- A
- Packing
- Per order
Design targets and release limits
| Property | Target | Limits | Unit | Method |
|---|---|---|---|---|
| Hardness | 75 | 70 to 80 | Shore A | ASTM D2240 / ISO 48-4, 1 s |
| Specific gravity | 1.85 | ±0.02 of approved value | ASTM D297 / ISO 2781 | |
| Tensile strength | 13 | min 10 | MPa | ASTM D412 die C / ISO 37 type 2 |
| Elongation at break | 220 | min 160 | % | ASTM D412 die C / ISO 37 type 2 |
| Modulus at 100 % | 5 | 4 to 7 | MPa | ASTM D412 die C / ISO 37 type 2 |
| Compression set, 22 h at 200 °C | 12 | max 18 | % | ASTM D395 method B, button |
| TR10 | -17 | max -15 | °C | ASTM D1329 / ISO 2921 |
| Heat ageing 70 h at 250 °C, hardness change | +3 | 0 to 5 | points | ASTM D573 / ISO 188 |
| IRM 903, 168 h at 150 °C, volume change | +3 | max 6 | % | ASTM D471 / ISO 1817 |
| ASTM Fuel C, 70 h at 23 °C, volume change | +4 | max 8 | % | ASTM D471 / ISO 1817 |
Qualification plan
The grade code says what this compound is designed for. This table says what it has passed: a duty is claimed only once its report is on file.
| Test | Standard or method | Conditions | Status |
|---|---|---|---|
| O-ring compression set | ISO 3601 / AS568-214 O-rings | 22 h and 1,000 h at 200 °C | Planned |
| Specification call-out | ASTM D2000 line call-out | To be issued with the first production data | Planned |
| Customer approvals | Seal maker qualification | Per customer | Planned |
Design targets are the values the compound is designed to reach. They are not measured results and they are not a warranty. Release limits apply to lots once the recipe is approved. The grade code says what the compound is designed for; the qualification plan says what it has passed. Confirm suitability in your own application and fluids.
Every lot is supplied with a certificate of analysis. Enter the lot ID under Track on the website to see the lot record. Pascalor is an independent brand and is not affiliated with any polymer manufacturer named elsewhere on this site.
Registered entity name to be added | quotes@pascalor.com