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The synergistic effects of zinc oxide (ZnO) with intumescent flame retardant (IFR; based on phosphorus acid, melamine and pentaerythritol) in silicone rubber (SR) composites have been studied using limiting oxygen index, UL-94, cone calorimeter test and digital photographs. The results showed that 2·0 wt-% loading ZnO in the flame retardant SR composites could greatly reduce the peak values of heat release rate and smoke production rate, and form a compact char layer on the surface of the sample. Thus, a suitable amount of ZnO plays a synergistic effect with IFR in flame retardant SR composites system.
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Jiao et al. (2013) studied this question.
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