Abstract: Melamine cyanurate(MCA), microcapsule red phosphorus(MCP), and magnesium hydroxide[Mg(OH)2] were compounded with an intumescent flame retardant PNP to prepare a multi-components flame retardant. The performance of the flame retardants in low-density polyethylene/ethylene-vinyl acetate (PE-LD/EVA) blends was studied. When the matrix resins of PE-LD/EVA was 70/30, the content of complex flame retardants was 35 %, the weight ratio of PNP/MCA was 3/2, limited oxygen index reached 30.8 %. When weight ratios of PNP/MCA/P =24/16/4 were used, the limited oxygen index was 32.3 %. A limited oxygen index of 30.9 % was observed at weight ratios of PNP/MCA/P/MH=24/16/4/22，the vertical combustion level reached UL 94 V-0, and the tensile strength was 11.1 MPa, the elongation at break was 80.6 %.

Key words: low-density polyethylene, ethylene-vinyl acetate, intumescent flame retardant, non-halogen flame retardancy, synergistic effect