Polytetrafluoroethylene (PTFE) is a technopolymer with excellent insulating dielectric characteristics; withstands high temperatures with continuous operation from -180 ° C to + 250 ° C, and has a remarkable resistance to aggressive chemical agents, guaranteeing very high smoothness. Its mechanical strength is very low and consequently also its wear resistance. It has food compatibility and is frequently used in the petrochemical, chemical and pharmaceutical industries in general.