Abstract: Using a blend of lowdensity polyethylene/ethylene vinyl acetate/ethylene propylene diene monomer(PELD/EVA/EPDM) as a basic resin, Mg(OH)2/Al(OH)3 and Mg(OH)2 as two kinds of flame retardants, cable jacket was produced and the effects of flame retardants on mechanical properties were studied. It showed that, tensile strength and limited oxygen index were increased and elongation at break was decreased with increasing Mg(OH)2 to Al(OH)3. When Mg(OH)2 was used, limited oxygen index was directly proportional to the loading of Mg(OH)2, tensile strength and elongation at break were inversely proportional to the loading of Mg(OH)2. When the content of Mg(OH)2 was between 40~50 phr, limited oxygen index reached to more than 29 %, mechanical properties were superior to those based on Mg(OH)2/Al(OH)3 system.

Key words: lowdensity polyethylene, ethylene vinyl acetate, ethylene propylene diene monomer, magnesium hydroxide, aluminium hydroxide, cable jacket, flame retardancy