Engineered for extremes
NBR General 90S
Read the code: NBR, GEN duty (general reference grade), 90 Shore A, S for sulfur 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 90 Shore A sulfur-cured NBR for oilfield and hydraulic seals where pressure and extrusion matter more than temperature, targeted at API 6A temperature class U (to 121 °C) after immersion testing.
- Polymer class
- NBR
- Duty
- GEN: general reference grade
- Hardness
- 90 Shore A
- Temperature range
- -25 to 121 °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 | 90 | 85 to 95 | Shore A | ASTM D2240 / ISO 48-4, 1 s |
| Specific gravity | 1.28 | ±0.02 of approved value | ASTM D297 / ISO 2781 | |
| Tensile strength | 16 | min 13 | MPa | ASTM D412 die C / ISO 37 type 2 |
| Elongation at break | 150 | min 110 | % | ASTM D412 die C / ISO 37 type 2 |
| Modulus at 100 % | 10 | 8 to 13 | MPa | ASTM D412 die C / ISO 37 type 2 |
| Compression set, 22 h at 100 °C | 15 | max 25 | % | ASTM D395 method B, button |
| TR10 | -20 | max -18 | °C | ASTM D1329 / ISO 2921 |
| IRM 903, 70 h at 100 °C, volume change | +5 | max 10 | % | 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 |
|---|---|---|---|
| Elastomer immersion | API 6A Annex F, sweet material classes (AA to CC) | At least 160 h at 121 °C (temperature class U) | Planned |
| Rapid gas decompression (optional) | ISO 23936-2 Annex B | As for the RGD grades | Planned |
| Specification call-out | ASTM D2000 line call-out | To be issued | 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