12 Gauge Tinned Plated Stranded Copper Tefzel Insulated Wire Product Description ETFE, which stands for ethylene tetrafluoroethylene, is a type of high-performance fluoropolymer. ETFE insulated wire refers to electrical wires that have their conductors coated or insulated with ETFE material. ETFE insulated wires have excellent electrical properties, including high temperature resistance, good dielectric strength, low friction, and high chemical resistance. Due to these