Animation of the formation of the plastic polytetrafluoroethylene (PTFE), sold as Teflon. PTFE is a long-chain polymer, produced by linking individual molecules of tetrafluoroethene (C2F4). During polymerisation the carbon-carbon double bond is broken, and each carbon links to the carbon of another tetrafluoroethene molecule. This forms long chains of -(C2F4)- groups. The presence of the fluorine makes the plastic extremely hydrophobic and gives it one of the lowest coefficients of friction known. As such, Teflon has found many uses in bearings, non-stick cookware and waterproof clothing.