Engineered for extremes
NBR Stator 75S
Read the code: NBR, STAT duty (stators), 75 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 75 Shore A NBR for mud motor and progressing cavity pump stators: low heat build-up, high tear and fatigue resistance and a strong bond to the steel tube, in oil-based and water-based fluids to about 120 °C.
- Polymer class
- NBR
- Duty
- STAT: stators
- Hardness
- 75 Shore A
- Temperature range
- -10 to 120 °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 | 72 to 78 | Shore A | ASTM D2240 / ISO 48-4, 1 s |
| Tensile strength | 20 | min 17 | MPa | ASTM D412 die C / ISO 37 type 2 |
| Elongation at break | 450 | min 350 | % | ASTM D412 die C / ISO 37 type 2 |
| Tear strength | 50 | min 40 | kN/m | ASTM D624 die C |
| Heat build-up (Goodrich flexometer) | 20 | max 28 | °C | ASTM D623 method A |
| Bond to steel | 9 | min 7, rubber failure | kN/m | ASTM D429 method B (90° peel) |
| 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 |
|---|---|---|---|
| Mud ageing | In-house method, published with results | Oil-based, synthetic and water-based mud at 120 °C | Planned |
| Dynamic fatigue | ASTM D623 and flex testing | Before and after ageing | Planned |
| Power-section test | With a motor or PCP maker | On the customer's stator geometry | 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