Water Vapor Permeability of Cosmetic Packaging

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Water Vapor Permeability Testing is mainly affect factor for cosmetic packaging. Through WVTR testing, technical indexes for control and adjustment of packaging materials can be achieved so as to meet the varied application needs. Take PERME W3/330 Water Vapor Transmission Rate Testing System as an example. Clamp the specimen in between the testing chamber, a flow of constant stable nitrogen flows in one side of the film and dry nitrogen flows in the other side. Owing to the humidity difference, water vapor would penetrate from the high humidity side into the low humidity side. The penetrated humidity (moisture) is carried by the dry nitrogen to the sensor, outputs electronic signal and then, calculates water vapor permeability quantity. For packaging bags and bottles, dry nitrogen flows inside the container and the outside is in high humidity state.

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