W360 Water Vapor Permeability Analyzer test the water vapor transmission rate of various materials, including: plastic film, composite film, aluminum-plated film, aluminum foil etc.; sheets, such as PP sheet, PVC sheet, rubber, building material, porcelain; other application, such as solar panel, paint film, medical patch etc. It is widely used in packaging, plastic film, food, pharmaceuticals, personal care industries, inspection agency, research institute, college and so on.
Gravimetric method. Hold distilled water in cup, seal the cup with test sample (not contacts water); put the cup and desiccant device in closed test chamber; in certain temperature condition, the water evaporates and the humidity inside the cup remains high (98-100%RH); as outside the cup it remains dry (0-8%RH) by desiccant, the water molecules penetrate through the sample from inside the cup to outside, and absorbed by the desiccant; then the cup weight will decrease; system weigh the decreasing cup weight so as to calculate the water vapor transmission rate.