- It is used to measure the water vapour permeability of plastic films, composite films, sheets used for packaging, and other materials used in medical packaging and in the construction industry.
Water vapour transmission rate is used to measure the permeation of water vapour through a film. It is done by generating a constant humidity difference between the two sides of the test specimen while maintaining a constant temperature. This allows the water vapour to transmit to the dry side and by measuring the weight at regular intervals, the rate of water vapour transmission can be obtained.
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