Shop for ETFE rods. ETFE (ethylene tetrafluoroethylene) commonly referred to as Tefzel® is a modified copolymer of ethylene and tetrafluoroethylene. ETFE is often used in applications that demand mechanical toughness, moderate stiffness, and outstanding chemical resistance. DuPont™ Tefzel® is FDA Compliant. Have machined into fabricated parts. Stocked materials typically ship in 2-5 business days. Can’t find what you need? Get a quote.