One of the thermal oxidation technologies recommended by the United Nations Environment Programme (UNEP) is destruction of chlorofluorocarbons (CFCs) in a cement kiln. The destruction of CFC12, CFC11 and CFC113 was studied in a cement Mn plant in actual commercial operation. CFCs were completely destroyed in the kiln under normal operating conditions. Hydrogen fluoride and hydrogen chloride generated by CFC decomposition were absorbed by cement materials. No formation of toxic halogenated organic compounds, such as polychlorinated dibenzo-p-dioxins or dibenzofurans (PCDDs/PCDFs), was observed in the CFC incineration.