A comprehensive thermochemical analysis of the equilibrium gaseous product composition resulting from burning chromium, hydrocarbon, and chlorohydrocarbon polymers in air at 101 kPa is presented. Calculations have been made over the range phi = 0.25-2.50 at adiabatic flame temperatures from 600 to 2100 K. The main chromium-containing species formed are CrO3, CrO2, CrO2Cl, and CrO2(OH). The yield of Cr(6 +) derivatives reaches a maximum of 77% at 1650 K and phi = 0.25, mainly in the form of CrO3(g). The yield of CrO, CrOCl, CrOCl2, CrO2Cl2, CrOOH, and CrO2(OH), does not exceed 0.1% of the initial chromium content, and that of other chromium-containing species is less than 10(-2) mol%. A reaction scheme is constructed on the basis of the data obtained. It includes reactions of the secondary oxidants CO2, H2O, HCl, OH, and O, as well as the reducing agents CO, H-2, and H.