Nok Corporation
Nok Hydrogen-Resistant O-rings
Manufacturer: Nok.
Features
- Compared with general-purpose EPDM and VMQ, it uses E9079, a low-temperature EPDM material for hydrogen resistance, which has excellent low-temperature properties, and a special VMQ
material. - Since the compression set is small, it is difficult to sag and has a long service life.
*EPDM = Ethylene Propylene Rubber
*VMQ = Silicone Rubber
Specifications
| Property | General-purpose EPDM (JIS EPDM-90 Equivalent) | Hydrogen resistance for low temperature EPDM (E 9079) | Special for Hydrogen resistance (VMQ) |
|---|---|---|---|
| Hardness (Duro-A Instant) | 89 | 80 | 81 |
| Tensile strength (MPa) | 12.4 | 20.8 | 9.5 |
| Elongation (%) | 130 | 210 | 270 |
| TR10 (°C) (Low temp. characteristics) | -43 | -57 | -70 (Under measurement limit) |
| H₂ Gas permeability (JIS K6275-1) | |||
| transmittance coefficient (mol·m / (m²·sec·Pa)) | 7.7E-15 | 6.0E-15 | 8.4E-14 |
