ePTFE waterproof film is a kind of waterproof breathable film material made of die-cutting through multiple processes, used in the air hole of waterproof electronic products, through high viscosity waterproof adhesive to stick on the shell, so as to ensure that the function of ePTFE waterproof film can play out normally, ePTFE waterproof film can be very good water, dust and other isolated in the membrane, ePTFE waterproof film good breathable performance can allow air molecules to enter and leave freely, so that it can achieve a good balance of pressure inside and outside the sealing shell of electronic products, so that even in the moment of sudden temperature change can dynamically achieve a balance of pressure inside and outside, so as to ensure the reliability of the seal.