FEP tubing possesses many equivalent features to PTFE but with certain traits that allow it to go where PTFE tubing cannot.
Fluorinated ethylene propylene, or FEP, was the first melt-processable perfluorinated polymer following the development of PTFE. Like PTFE, FEP tubing shows exceptionally broad chemical resistance with very low coefficient of friction. FEP tubing, however, is more flexible than PTFE and is optically transparent. For areas where temperature is a consideration, FEP can be used up to 204 °C (400 °F) and is UL 94 V-0 flame resistant.
FEP shows extremely low absorption of solvents. FEP can be used in a wide variety of applications spanning medical, aerospace, fiber optics, and much more. FEP is heat-formable and weldable, allowing it to be mated to other plastics for connections or unions. Multi-lumen tubing, custom profiles, and colors are also available with FEP.