PTFE filter Film uses the fiber junction characteristics of PTFE, by press, stretching, desticking, high temperature stretching, shaping and other processes, so that the surface of the product is smooth, chemical corrosion resistance, air permeability (wind), flame retardant, high temperature resistance, strong acid resistance, alkali resistance, non-toxic. Their pore size, thickness and porosity can be adjusted during stretching according to different requirements.