Abstract: A phosphorus-silicon compound (EMPZR) and ammonium polyphosphate (APP) were used as an intumescent flame retardant in poly(ethylene-co-vinyl acetate)(EVA) It was found that when the loading of intumescent flame retardant was 40 %(APP:EMPZR=1:1), the limiting oxygen index value reached 28.6 %, and the burning grading reached UL-94 V-0; the tensile strength was 6.4MPa, and the elongation at break was 592 %; TGA showed that the char yield was 15 % at 800 ℃.The synergistic effects of EMPZR and APP was studied by SEM and FT-IR.

Key words: ethylene-vinyl acetate copolymer, phosphorus-silicon flame retardant, ammonium polyphosphate, synergistic flame retardancy