Polytetrafluoroethylene (or PTFE) is a thermoplastic polymer that is a white solid at room temperature. Its molecular chain consists of only fluorine and carbon atoms, and this bond strength means that it is inherently non-reactive and hydrophobic. PTFE also has an extremely low coefficient of friction, one of the lowest among all solids.

PTFEs are commonly known by the brand name Teflon, a copyright of Chemours (a Du Pont spin-off).