Synergistic flame-retardant effects of aluminum oxide with layered double hydroxides in EVA/LDH composites

ABSTRACT: The synergistic effects of aluminum oxide (Al2O3) with layered double hydroxides (LDH) in ethylene vinyl acetate copolymer/LDH (EVA/LDH) composites have been studied using limiting oxygen index, UL-94 tests, and cone calorimeter test (CCT). The results from the UL-94 tests show that the Al2O3 can act as flame-retardant synergistic additive in EVA/LDH composites, and 2 phr Al2O3 can raise UL rating from V-1 to V-0 at 120 phr loadings of additives. The CCT data indicated that the addition of Al2O3 in EVA/LDH system can greatly reduce the heat release rate, mass loss rate, and the production rate of carbon monoxide. KEY WORDS: synergistic effect, layered double hydroxide, halogen-free flame retardant