5/51 in. (0.098) Natural Tefzel High Performance Plastic Balls

Ethylene tetrafluoroethylene, ETFE, a fluorine based plastic, was designed to have high corrosion resistance and strength over a wide temperature range. ETFE is a polymer, and its systematic name is poly (ethylene-co-tetrafluoroethylene). ETFE has a very high melting temperature, excellent chemical, electrical and high energy radiation resistance properties. When burned ETFE releases hydrofluoric acid.

ETFE has an approximate tensile strength of 42 N/mm_ (6100 psi), with a working temperature range of 89 K to 423 K (-185ºC to 150ºC or -300ºF to 300ºF).