1-Chloro-1,2,2,2-tetrafluoroethane, C<sub>2</sub>HClF<sub>4</sub>, is a hydrochlorofluorocarbon used as a component in refrigerants offered as replacements for chlorofluorocarbons. HCFC-124 is also used in gaseous fire suppression systems as a replacement for bromochlorocarbons.