Indeed, H2 gas has extremely small molecules that tend to pass through coating materials, so it is essential to use materials with specific features. Taking into account the particularly high pressure (350-700 bar) at which compressed hydrogen is stored for fuel cell applications, it generates so much force that seals must be tighter. Even the manufacturing process itself requires special measures to be taken. The assembly lines must be set up in a clean room. This prevents contamination of the valves from dirt particles, which could potentially lead to gas leaks.

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