Pkg systems should show container - closure integrity

There are a number of water vapour transmission rate/moisture vapour transmission rate testing methods that conform to be recognized United States and international ASTM, ISO, and TAPPI standards such as Gravimetric (Cup) method; Electrolytic detection sensor method; Infrared detection sensor method; Humidity detection sensor method.

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The moisture resistance of substrate/barrier materials is commonly measured by determining the permeation of a material. Permeation is a three-stage process. First, a gas or vapour, a permeate is absorbed into a materials surface. Second, the gas or vapour diffuses throughout the material. Third, the gas or vapour desorbs (go away from the surface to which a substance is adsorbed).