Engineered for extremes
HNBR Transformer 70P
Read the code: HNBR, TRF duty (transformers and electrical equipment), 70 Shore A, P for peroxide 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 HNBR for transformer, switchgear and electrical equipment gaskets in mineral oil and in natural and synthetic esters: low compression set at temperature, low-temperature flexibility and a fluorine-free formulation.
- Polymer class
- HNBR
- Duty
- TRF: transformers and electrical equipment
- Hardness
- 70 Shore A
- Temperature range
- -40 to 130 °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 |
| Tensile strength | 20 | min 16 | MPa | ASTM D412 die C / ISO 37 type 2 |
| Elongation at break | 350 | min 250 | % | ASTM D412 die C / ISO 37 type 2 |
| Compression set, 70 h at 125 °C | 18 | max 25 | % | ASTM D395 method B, button |
| TR10 | -35 | max -30 | °C | ASTM D1329 / ISO 2921 |
| Mineral insulating oil (IEC 60296), 168 h at 125 °C, volume change | +5 | max 10 | % | ASTM D471 / ISO 1817 |
| Natural ester (IEC 62770), 168 h at 125 °C, volume change | +8 | max 15 | % | ASTM D471 / ISO 1817 |
| Compatibility with insulating oil | Pass | pass | ASTM D3455 |
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 |
|---|---|---|---|
| Material compatibility with insulating oil | ASTM D3455 | Mineral oil, natural and synthetic ester | Planned |
| Fluid immersion | ASTM D471 | Mineral oil, natural ester, synthetic ester at 125 °C | Planned |
| Transformer OEM approval | Customer qualification | Per OEM | 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