What is wvtr?



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Moisture vapor transmission rate, also water vapor transmission rate, is a measure of the passage of water vapor through a substance. Moisture vapor transmission rate (MVTR), also water vapor transmission rate ( WVTR), is a measure of the passage of water vapor through a substance. Understanding WVTR Water Vapor Transmission rate testing. Determine water vapor transmission rate of flexible barrier materials used in packaging or industrial applications. “Water vapor transmission rate” (WVTR), often referred to as “moisture vapor transfer rate” (MVTR), is the standard indicator of how easily moisture can permeate. The water vapour transmission rate (WVTR) of films and packs is tested using the MOCON PERMATRAN-W 3/33.



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