Engineered for extremes
EPDM H2 75P
Read the code: EPDM, H2 duty (hydrogen service), 75 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 75 Shore A peroxide-cured EPDM for electrolyser stacks and their balance of plant: resistance to 25 to 30 % potassium hydroxide at 85 °C in alkaline stacks, to deionised water and oxygen in PEM stacks, low extractables to protect membranes and catalysts, and no fluorine in the formulation.
- Polymer class
- EPDM
- Duty
- H2: hydrogen service
- Hardness
- 75 Shore A
- Temperature range
- -40 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 | 70 to 80 | Shore A | ASTM D2240 / ISO 48-4, 1 s |
| Specific gravity | 1.12 | ±0.02 of approved value | ASTM D297 / ISO 2781 | |
| Tensile strength | 14 | min 11 | MPa | ASTM D412 die C / ISO 37 type 2 |
| Elongation at break | 300 | min 200 | % | ASTM D412 die C / ISO 37 type 2 |
| Compression set, 22 h at 150 °C | 12 | max 20 | % | ASTM D395 method B, button |
| TR10 | -45 | max -40 | °C | ASTM D1329 / ISO 2921 |
| 30 % KOH, 1,000 h at 85 °C, volume change | +3 | max 8 | % | ASTM D471 / ISO 1817 |
| 30 % KOH, 1,000 h at 85 °C, hardness change | -3 | -8 to 5 | points | ASTM D471 / ISO 1817 |
| Deionised water, 1,000 h at 90 °C, volume change | +3 | max 8 | % | ASTM D471 / ISO 1817 |
| Ionic extractables, 168 h at 90 °C in deionised water | To report | Agreed with the stack maker | Conductivity and ion chromatography of the soak water |
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 |
|---|---|---|---|
| Electrolyte ageing | In-house method, published with results | 25 to 30 % KOH at 85 °C for 1,000 h and 3,000 h, free and compressed: volume, hardness, tensile and compression set | Planned |
| Water and oxygen ageing | In-house method, published with results | Deionised water and oxygen-saturated water at 80 to 90 °C for 1,000 h | Planned |
| Extractables | Conductivity and ion chromatography of the soak water | Ions and organics released in 168 h at 90 °C | Planned |
| Hydrogen permeability | ISO 2782-1 | Hydrogen at 23 °C and 80 °C | Planned |
| Stack qualification | ISO 22734 system requirements, with an electrolyser maker | On the customer's stack design | 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.
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