What is Tefzel Wire? Tefzel wire is a type of high performance hook up wire made with an ETFE (Ethylene Tetrafluoroethylene) insulation, commonly branded under the name “Tefzel”. It’s engineered for use in applications where ordinary wire insulation would break down including areas exposed to heat, chemicals, and scratching. Tefzel insulation is known for its toughness, lightweight ... https://jonard.com/wire/tefzel-wire