Polychlorotrifluoroethylene (PCTFE or PTFCE) is a thermoplastic chlorofluoropolymer with the molecular formula (CF2CClF)n, where n is the number of monomer units in the polymer molecule.

[2] It was discovered in 1934[3][4] by Fritz Schloffer and Otto Scherer who worked at IG Farben Company, Germany.

[5] After World War II, PCTFE was commercialized under the trade name of Kel-F 81 by M. W. Kellogg Company in early 1950s.

[8] Other current and former trade names of PCTFE include Hostaflon C2 from Hoechst, Fluon from ICI, Plaskon from Allied Chemical Corporation, Halon from Ausimont USA,[9][10] and Ftoroplast-3 in the USSR and Russian Federation.

[2] PCTFE is resistant to the attack by most chemicals and oxidizing agents, a property exhibited due to the presence of high fluorine content.

[20] PCTFE exhibits a permanent dipole moment due to the asymmetry of its repeating unit.

PTFE has a higher melting point and is more crystalline than PCTFE, but the latter is stronger and stiffer.

[22] PCTFE has lower viscosity, higher tensile strength and creep resistance than PTFE.

[15] PCTFE is used to protect sensitive electronic components because of its excellent electrical resistance and water repulsion.

[23][22] Low-molecular-weight PCTFE waxes, oils and greases find their application as inert sealants and lubricants.