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The stabilities of trichlorotrifluoroethane metal systems are discussed under simulated solvent-cleaning conditions and under solvent-vapor entrapment conditions at temperatures up to 450°F. Comparisons are made with other systems containing water, acetone, trichlorethylene, and 1,1,1-trichloroethane. The data show (1) the systems with trichlorotrifluoroethane are chemically stable, and (2) the solvent can be used to clean austenitic stainless steels regardless of heat sensitization and degree of stress. With reasonable cleaning practices, residual solvent vapors in entrapment configurations are not expected to cause difficulties with austenitic stainless steels at elevated temperatures.
stainless steels, cleaning, solvents, surfactants, contamination
Gorski, R. A.
Senior research chemist, Freon Products Laboratory, E. I. du Pont de Nemours & Company, Inc., Wilmington, Del.