Hydrocarbons act as chain-transfer agents to provide telomeric products in the radical polymerization of tetrafluoroethylene. At 125 °C, linear alkanes (hexane, nonane, and decane) participate by transferring more than one hydrogen; by contrast, cyclopentane and cyclohexane do not. Methylcyclohexane is attacked only at the tertiary hydrogen. For comparison, the chain transfer of nonane with hexafluoropropene and chlorotrifluoroethylene as well as with tetrafluoroethylene was studied.