CCl2F2

CCl2F2 (difluorodichloromethane, CFC-12) is a halogenated hydrocarbon compound historically classified and used as a refrigerant and aerosol propellant. While this material is now largely phased out under the Montreal Protocol due to ozone-depletion potential, it remains relevant in legacy equipment maintenance, historical documentation, and specialized low-temperature applications where alternatives are impractical or unavailable. Engineers encounter CCl2F2 primarily when servicing or decommissioning older air-conditioning, refrigeration, and foam-blowing systems, where understanding its properties is essential for safe handling and environmental compliance.