Add time:09/06/2019         Source:sciencedirect.com

Studies have been made of the flammability [expressed in terms of the limiting oxygen index (LOI)] and the smoke-forming tendency [expressed in terms of the maximum smoke density (Ds)] of systems containing widely varying proportions of an acrylonitrile-butadiene-styrene terpolymer (ABS), DECABROMOBIPHENYL (cas 13654-09-6) (DBB) and (a) anhydrous aluminium(III) oxide, (b) aluminium(III) oxide monohydrate and (c) aluminium(III) oxide trihydrate. The values of LOI and Ds have been plotted by polynomials up to the fourth order and plotted in triangular diagrams. The optimum aluminium/halogen atomic ratios for flame retardance are different for the three oxides. Flame-retardant synergism has been observed, however, between all three oxides and DBB and is particularly marked with anhydrous alumina and the halogen compound. All the systems also give a significant degree of smoke-suppression. Simultaneous thermal analyses strongly suggest that the flame-retardant action of the aluminium compounds is not purely physical and is largely confined to the condensed phase.

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