Concentrates for fire-fighting foam

Details Concentrates for fire-fighting foam Concentrates for fire-fighting foam

1980-12-08

1983-06-07

Kight, III, John

Compositions

Fire-extinguishing

Foam or gas phase containing

252 805, 252307, 2523635, 169 44, 169 46, 169 47, A62D 100

Patent

active

043870325

ABSTRACT:
Fire-fighting foam effective against burning hydrophilic or polar liquids like lower alcohols, ketones, etc. is made from concentrate containing thixotropic thickener dissolved in large amount, up to 1.5% or more, yet has a tolerable viscosity so that it can be poured or pumped. Heteropolysaccharide-7 or chain-shortened modifications of it are particularly suitable for this purpose. Higher concentrations are made practical by including in the concentrate urea, thiourea, ammonium cyanate or ammonium thiocyanate, to reduce the concentrate's viscosity and keep the polysaccharide from separating out upon freezing. Magnesium salts can also be dissolved in concentrate to improve fire extinguishing action when diluted with fresh water.

REFERENCES:
patent: 2088085 (1937-07-01), Gross et al.
patent: 3915800 (1975-10-01), Kang et al.
patent: 4060489 (1977-11-01), Chiesa, Jr.
patent: 4149599 (1979-04-01), Chiesa, Jr.

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