Abstract: A stable 1,1,1-trichloroethane composition containing 1,1,1-trichloroethane and, as the essential acid acceptor, 0.25 to 1 weight percent of a C.sub.4-8 monoepoxide, epichlorohydrin or a mixture of such epoxides and, as the essential stabilizer against metal-induced decomposition, 3.5 to 4.5 weight percent of a three-component system selected from the group consisting of:Dioxane,Trioxane,Dioxolane,T. butyl alcohol, andA C.sub.1-3 nitroalkane or mixtures of nitroalkanes, in a proportion one to the other within the shaded areas of FIGS. 1-9, provided that when a nitroalkane is not present as a member of the three-component mixture, it is added in an amount to provide from about 0.25 to 1 percent by weight of said nitromethane.The composition set forth balances inhibitor content to obtain protection in both the liquid and vapor without excessive losses or concentrations disproportionate with solvent losses through vapor escape or liquid dragout.