Chlorofluorocarbons and hydrochlorofluorocarbons are fully or partly halogenated hydrocarbons that contain carbon, hydrogen, chlorine, and fluorine. They are produced as volatile derivatives of methane, ethane, and propane.
The most common example of a CFC is dichlorodifluoromethane. R-12, also commonly called Freon, is used as a refrigerant. From Wikipedia
