There are many kinds of Teflon wires, PFA, PTFE, FEP, ETFE... The polytetrafluoroethylene insulation is PTFE, because the requirements for conductors are strict, and the conductors must be nickel-plated or silver-plated. Polyperfluoroethylene propylene insulation material is FEP. Ethylene-tetrafluoroethylene copolymer insulation is ETFE. Perfluoroalkoxy resin insulation is PFA. These are all called Teflon wires
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