What is the difference between PFA, FEP, TPFE and Tefzel are Teflon insulation materials?

Many fluoropolymers belonging to the Teflon family can be used as electrical insulation. Among them, the vast majority of materials were first developed by DuPont. So far, DuPont is still the world's largest manufacturer of the vast majority of fluoropolymers. These materials include FEP (Fluorinated ethylene propylene copolymer), PFA (Teflon-Perfluoroalkoxy vinyl ether copolymer), PTFE (Polytetrafluoroethylene)And Tefzel (Ethylene-Polytetrafluoroethylene copolymer). These materials have many similarities, such as excellent resistance to harsh chemical environment, moisture resistance, flame retardant performance, and other characteristics of electrical insulation materials. Among them, Tefuzel's continuous rated temperature is only 150 ℃, but it has good toughness and can resist mechanical impact and damage. FEP is rated at 200 ℃ and will not produce smoke when burning. The constant temperature of PTFE and PFA is 250 ℃, both of which have good outdoor aging resistance, including carbon arc, sun exposure and rain.