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gas seperation/barrier

gas seperation/barrier

gas seperation/barrier

(OP)
any plastics that are permeable to water vapor but impermeable to larger gas molecules (50-150 m.w.)??

RE: gas seperation/barrier

Yes. Several plastics are much more permeable towards water vapor than towards N2, O2 or CO2. Examples are plasticized PVC or PVF. The material with the highest water vapor permeability but a very low permeability towards other gasses, though, would be PA6. Please note that PA66 and other polyamides have a much lower water vapor permeability so you must use PA6.

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