How is the waterproof vapor barrier film waterproof?
The working principle of the waterproof vapor barrier membrane can be divided into two types: microporous and hydrophilic groups. The waterproof and breathable membrane adopts the former, because the minimum diameter of water droplets is about 20 microns, while the diameter of water vapor molecules is only about 0.0004 microns. , There is a huge difference between the diameters of the two, water vapor can pass through the microporous membrane by the principle of diffusion, and liquid water or water droplets are due to the effect of surface tension.
