The flammability characteristics and synergistic effect of zinc borate with antimony trioxide in araldite resin composite have been studied by thermal erosion test . Zinc borate was added first to araldite resin reinforced by hybrid carbon-Kevlar fibers as a surface layer(5mm) thickness .Then, the result composite material was exposed to a direct flame generated from Oxyacetylene torch (3000°C) with different flame exposure intervals (10,20mm), and study the range of resistance of retardant material layer to the flames and protected the substrate .After that , antimony trioxide was added to zinc borate with various amount(10%,20%,30%) to forming a hybrid flame retardant for enhance the action of this material to react flame . Hybrid retardant exposure to same flame temperature and exposure distances. Method of measuring the surface temperature opposite to the flame was used to determined the heat transferred to composite material . the best results was obtained with large exposed distance and large percentage from protective layer which is zinc borate with (30%) antimony trioxide .
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