An experimental study of reactions and stable products from pyrolysis of Freon 113 (1,1,2-trichloro trifluoro ethane) under inert and hydrogen rich conditions has been performed over the temperature range 923-1098 K. A tubular flow reactor was fed a mixture of 2% Freon 113 with the balance helium or helium/hydrogen mixtures. Results show this chlorofluorocarbon to be relatively stable to decomposition in n inert atmosphere, requiring temperatures in excess of 1048 K to achieve greater than 99% conversion to products for 2 seconds reaction time. Products of self reaction include CF2Cl2, C2F3Cl, C2F3Cl, and CF3CCl3. Addition of small amounts of H2was shown to dramatically accelerate decomposition and shift the reaction products to a complex mixture of hydrochlorofluorocarbons (HCFC's), hydrofluorocarbons (HFC's) and hydrocarbons (HC's). At 923 K and 2 seconds reaction time, a mixture of 2% Freon 113 in helium results in less than 10% conversion, however, the addition of hydrogen at a mole ratio to Freon 113 of 7, results in nearly 90% conversion. Hydrocarbon products appear to represent as much as 30% of the freon feed under some conditions, and this defluorination is only favored at higher temperatures. Reaction under reducing conditions was shown to produce significant amounts of hydrogen fluoride (HF) and hydrogen chloride (HCl) gas, while inert conditions appeared to produce what is believed to be such inter-halogens as CIF,CIF3and CIF5.