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The possibility of partial replacement of antimony trioxide by nontoxic fl ame retardants (Cloisite 15A organoclay, microquartz, Cloisite 15A + microquartz and aluminum hydroxide + barium borate combinations) was examined for vulcanized rubber based on general-purpose isoprene (SKI-3) and butadiene (SKD) rubbers. The rheometric, physicomechanical, and thermal properties and the fl ame resistance of vulcanized rubber samples containing various fl ame retardants were studied. Combination of antimony trioxide with Cloisite 15A shows high performance as fl ame retardant owing to intercalation of rubber macromolecules into the interlayer space of the layered silicate, which is the base component of Cloisite 15A. The intercalation leads to a decrease in the diffusion of the degradation products and to deceleration of the rubber combustion. Combination of antimony trioxide with the aluminum hydroxide + barium borate system also shows high performance as fl ame retardant owing to successive endothermic processes of decomposition of the formulation components.

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