This standard is concerned with the following chlorofluorocarbons: trichlorofluoromethane (chlorofluorocarbon 11), dichlorodifluorom-ethane (chlorofluorocarbon 12), chlorodifluoromethane (chlorofluoro- carbon 22) and dichlorotetrafluoroethane (chlorofluorocarbon 114) used for industrial purposes.