The PTFE film has good heat resistance and self - moistening, and can be widely used as a sealing material for high temperature liquid transport tube and corrosive liquid pipe. If the pipe joint of the heating industry is used in the past, the polytetrafluoroethylene film has been used as a binder, which can greatly increase the use cycle.
The selected polytetrafluoroethylene film has a selective permeability, which can be selectively permeable through gas or liquid, which can be used as a separation material. Such as TFE and N- vinyl pyrrole graft copolymer film is a weak alkaline membrane, can be used as osmotic gasifying membrane for separation and concentration, such as concentrated water ethanol, two methyl acetamide concentration, separation distillation method can not take separated azeotrope.
The polytetrafluoroethylene film produced by calendering is stretched at high temperature. After heat treatment, it can be made into porous membrane for gas liquid separation, gas gas separation and liquid liquid separation, such as separation of argon from isotopes, separation of chloroform and water, etc.