2013•Plastics Rubber and Composites Macromolecular EngineeringRequires access

Synergistic effects of zinc oxide in intumescent flame retardant silicone rubber composites

Chuanmei Jiao, Jinlong Zhuo, Xilei Chen

Abstract

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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Key concepts: Intumescent, Fire retardant, Cone calorimeter, Pentaerythritol, Materials science, Limiting oxygen index, Composite material, Zinc borate