General waterproof vapor permeation film used by the vapor permeation film is through the principle of microporous, hot melt adhesive in the composite process easy to make the microporous plug, resulting in no vapor permeation, or overstretch the microporous become large leading to material leakage, so that the material lost its own vapor permeability, waterproof function.



The hydrophilic group is added into the polymer vapor permeation film. The hydrophilic property of hydrophilic group makes water droplets unable to penetrate and water vapor can freely penetrate, so as to ensure the stability of the product's vapor permeation waterproof performance and durability of service life. At the same time, no glue heat composite process is adopted, the micro porous porous membrane will not be blocked completely, and the air permeability is greatly improved.