| H2 | Hydrogen |
| N2 | Nitrogen |
| NBR | Nitrile butadiene rubber |
| SEM | Scanning electron microscopy |
| ATR-FTIR | Attenuated total reflectance Fourier transform infrared spectroscopy |
| VMQ | Silicone rubber |
| FKM | Fluoroelastomer |
| EPDM | Ethylene propylene diene monomer |
| COF | Coefficient of friction |
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