What has lower O2 gas permeability – Nylon, Copper, Stainless????

I have some customers that are needing to test in the sub PPM levels for some elements like H2, N, and O2. They have the instruments, but the incoming gas is becoming contaminated on the way from the .99997% pure gas to the instrument.

What tubing would be best? I have found that some say stainle

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