STABILIZATION OF HIGH DENSITY FOAMS SODIUM SALT OF CARBOXYMETHYLCELLULOSE

Foam firefighting capacity depends on both its resistance to some destroying factors and preserving its insulating property. Nowadays increasing of firefighting equipment using low-expansion foam is observed. The main feature of such foam is a high rate of flow that results in its loss of capacity to resist to thermal and mechanical action. Our investigation considers the influence of 0.25–2.0 màss. % sodium carboxymethyl cellulose salt (Na CMC) on synaeresis and foam thermal stability. The presence of Na CMC in a solution significantly reduces the rate of flow. It should be mentioned that Na CMC can react with the adsorbed layers and due to solvation it keeps a large amount of the solution in the films saving stable foam structure for a long time. The thermal effect on foam containing Na CMC leads to the protective film formation and prevents it from degradation.