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In the state of containing water vapor, the water particles are very small, and according to the principle of capillary movement, they can smoothly penetrate to the other side of the capillary, so that the phenomenon of vapor transmission occurs. When the water vapor condenses and turns into water droplets, the particles become larger. Due to the effect of the surface tension of the water droplets (the water molecules “pull and compete” with each other), the water molecules cannot smoothly separate from the water droplets and penetrate to the other side, which prevents The penetration of water occurs, so that the vapor permeable membrane has the function of waterproofing.There are three main types of waterproof and breathable membranes: PP spunbonded non-woven fabric, glass fiber breathable membrane, PET breathable membrane