The rate of water vapor flow, under steady specified conditions, through a unit area of a material, between its two parallel surfaces and normal to the surfaces. Metric unit of measurements is 1 g/24 h·m2. See PERM. (Paint and Coating Testing Manual (Gardner-Sward Handbook) MNL 17, 14th Ed., ASTM, Conshohocken, PA, (1995); www.astm.org)
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Gooch, J.W. (2011). Water Vapor Transmission (WVT, WVTR). In: Gooch, J.W. (eds) Encyclopedic Dictionary of Polymers. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-6247-8_12722
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