Used to determine the types of fabrics, including breathable coated fabric plastics, films, etc. WVT. Permeable cup made of aluminum alloy, with a rubber gasket, with the perspective cup containing hygroscopic agent and water, and sealed with a fabric sample placed at a predetermined temperature and humidity environment, according to a certain time permeable cup (including samples and hygroscopic agent or water) to calculate the change in the mass of water vapor permeability.

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