Abstract: Novel stabilized polyhalogenated polyol blends are disclosed which include in the blend a catalytic amount of a tertiary amine urethane catalyst and a stabilizing amount of a particular diepoxide. The polyol blends retain the same catalytic reactivity for reaction with organic polyisocyanates to form polyurethane foams over extended storage periods and are also stable with respect to blend viscosity. The polyurethane foams prepared from the stabilized polyol blends are characterized by excellent flame resistance and low smoke evolution when tested according to the ASTM E-84 test. The stabilized polyol blends provide an efficient means for reducing the number of polyurethane forming components or streams that need be stored, handled, or pumped to a polyurethane foam mixing apparatus.