Abstract
Studies have been made of the combustion of flexible foamed polyurethanes and of the effect there-on of a wide range of halogen- and phosphorus-containing compounds, with particular reference to the chemical reactions occurring during “ageing” of the foams. Flammability measurements show that ageing improves the fire resistance of foams containing the two most effective flame-retardant additives (tris (2,3-dibromopropyl) phosphate and tris (2-chloroethyl) phosphate) when these are present in more than a critical concentration. Thermal degradation studies indicate that at least a part of these additives is incorporated into the polyurethane structure. The relative effectiveness of all the compounds investigated is discussed in the light of known mechanisms of flame retardance.
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