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Glossary:Permeation
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Movement of gas to and through an elastomer.
Also
Penetration of a permeate (such as a liquid, gas, or vapour) through a solid. (Note - In case of natural gas through pipelines made of polymer materials, it is directly related to the pressure of the gas, intrinsic permeability of polymer materials and wall thickness. Polymers can be polyethylene, polyamide or PVC.)[1]