Polytetrafluoroethylene (Polytetrafluoroethylene, abbreviated as teflon, generally known as "non-stick coating" or "easy to clean materials. This material is resistant to acids, alkalis, and various organic solvents, and is virtually insoluble in all solvents. At the same time, PTFE is characterized by high temperature resistance, its coefficient of friction is extremely low, so it can be used as a lubricant role, but also become easy to clean the inner layer of the water pipe ideal coating.