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US 5,833,874 AGranted
Fire extinguishing gels and methods of preparation and use thereof
AssigneePowsus, Inc.
InventorsHarry E. Stewart, Donald B. MacElwee
Life of this patent
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Abstract
Fire-extinguishing compositions of low ozone depletion potential comprise dry particles of fire-extinguishing agents dispersed in a gel of liquified volatile perfluorocarbons, chlorofluorocarbons or hydrofluorocarbons. The dry particles are compatibilized with the carrier gel by the presence of a surfactant system composed of a non-ionic surfactant, a film forming fluorocarbon surfactant and a phosphorus containing antiflocculent.
Claims22
A substantially non-aqueous, flame-extinguishing gel composition of low ozone depletion potential, which comprises;
- a plurality of particles of a dry powder fire-extinguishing agent, dispersed in a gel, comprised of:
- 30 to 70 percent by weight of the total gel composition of a liquefied fire-extinguishing, gas of low ozone depletion potential;
- 0.5 to 10 percent by weight of the total gel composition of a hydrophilic, non-ionic surfactant;
- 0.001 to 0.5 parts by weight of the total gel composition of a film-forming fluorocarbon surfactant of the formula:
- C.sub.n F.sub.2n+1 SO.sub.3 H wherein n is from 5 to 20, and the alkali metal salts thereof;
- and
- 5 to 10 percent by weight of the total gel composition of a phosphorus-containing antiflocculent.
4 more elements
Dependencies are inferred from the claim text.