PTFE-lined pipe manufacturing process PTFE-lined pipes are pipes with a composite polytetrafluoroethylene (PTFE) lining inside a metal pipe. PTFE's superior chemical stability resists the erosion of almost all corrosive media such as strong acids, strong alkalis, and strong oxidants, providing long-term corrosion protection for the metal pipe. Simultaneously, its extremely low coefficient of friction reduces the resistance to media transportation, prevents media impurities from forming scale and