Abstract: A fire extinguishing composition which comprises bromofluorohydrocarbon and/or bromochlorofluorohydrocarbon and a fluorine-containing high molecular compound.

Abstract: An aqueous fire-extinguishing composition comprising an aqueous solvent and a water-soluble high molecular compound which contains a fluoroalkyl group and a water-solubilizable group, has an average molecular weight of not less than 5,000 and fluorine content of not less than 10% by weight and is soluble in water in an amount of at least 0.1% by weight at 25.degree. C. and the surface tension of which is not more than 50 dyn/cm when measured on 0.1 to 5.0% by weight aqueous solution at 25.degree. C. has excellent fire-extinguishing performance on fire of cooking oil, particularly of frying oil.

Abstract: Use of a water-soluble high molecular compound which contains a fluoroalkyl group and a water-solubilizable group, having a molecular weight of not less than 5000 and a fluorine content of not less than 10% by weight and is soluble in water in an amount of at least 0.1% by weight at 25.degree. C. and of which the surface tension is not more than 50 dyn/cm when measured on 0.1 to 5.0% by weight aqueous solution at 25.degree. C., as an additive to a foam fire-extinguishing agent so as to improve and enhance the fire-extinguishing performances of the latter, particularly for the firing of polar organic solvents, is disclosed.

Abstract: A fluorine-containing betaine compound of the formula: ##STR1## wherein Rf is a polyfluoroalkyl group having 3 to 21 carbon atoms, A is a group of the formula: ##STR2## (wherein R.sup.4 is a hydrogen atom or an acyl group having 2 or 3 carbon atoms and p is an integer of 1 to 5), R.sup.1 is a hydrogen atom, an alkyl group having 1 to 20 carbon atoms or a group of the formula: Rf--A--, R.sup.2 and R.sup.3 are each a hydrogen atom, an alkyl group having 1 to 3 carbon atoms or a hydroxyalkyl group having 1 to 3 carbon atoms, m is an integer of 2 to 6 and n is an integer of 1 to 4, which is useful as an additive to a foam fire-extinguishing composition for polar organic liquids.