Water-sodium dodecyl sulfate-triethanolamine-1-pentanol-1,1,2,2-tetrafluorodibromoethane (C2F4Br2) microemulsions differing in the H2O/C2F4Br2 ratio and content of surfactants were prepared. The principal possibility of combining halogenated hydrocarbons with water for developing new fire-extinguishing formulations was demonstrated. The emulsions obtained are of the oil-in-water type and are incombustible. The flash point and heat capacity of the systems were determined.