Engineered for extremes
NBR General 70S
Read the code: NBR, GEN duty (general reference grade), 70 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 70 Shore A sulfur-cured NBR for general O-rings and seals in mineral oils, greases, water and glycols to about 110 °C: the grade most seal lines run every day, supplied with the same lot data as the premium range.
- Polymer class
- NBR
- Duty
- GEN: general reference grade
- Hardness
- 70 Shore A
- Temperature range
- -30 to 110 °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 | 70 | 65 to 75 | Shore A | ASTM D2240 / ISO 48-4, 1 s |
| Specific gravity | 1.25 | ±0.02 of approved value | ASTM D297 / ISO 2781 | |
| Tensile strength | 15 | min 12 | MPa | ASTM D412 die C / ISO 37 type 2 |
| Elongation at break | 380 | min 300 | % | ASTM D412 die C / ISO 37 type 2 |
| Compression set, 22 h at 100 °C | 12 | max 20 | % | ASTM D395 method B, button |
| TR10 | -25 | max -22 | °C | ASTM D1329 / ISO 2921 |
| IRM 903, 70 h at 100 °C, volume change | +10 | max 15 | % | ASTM D471 / ISO 1817 |
| Heat ageing 70 h at 100 °C, hardness change | +5 | 0 to 8 | points | ASTM D573 / ISO 188 |
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 |
|---|---|---|---|
| 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