Abstract: The behaviour of flammability of linear low density polyet hylene(LLDPE)treated with The int umescent flame retardant containing starch has been investigated by using cone calorimeter at incidenTheat flux of 50kW·m^-2in this paper.Based upon The parameters, such as peak heat release rate(p k-HRR), total heat release(THR), effective heatof combustion (EHC), peak smoke production rate(pk-SPR), total smoke production(TSP)and mass loss rate (MLR), etc.taken from The cone calorimeter, some results were obtained as follows:Firstly, starch-containing intumescent flame retardant(S-IFR) obviously lowered pk-HRR, THR and EHC, i.e., 485 kW·m^-2, 905kJ, 33.2 MJ·kg^-1respectively for LLDPE/S-IFR, 1951kW ·m^-2, 1019 kJ, 44.7MJ·kg^-1for LLDPE. pk-HRR increased slightly with increasing the percentage of starch in char forming agent s;secondly, S-IFRmade pk-SPR of LLDPE becomelower, however, it significantly enhanced TSP at The end of combustion;finally, S-IFR promot-ed The Thermal degradation of LLDPEearlier, and made The rate of Thermal degradation lower.

Key words: Starch, Starch-containing intumescent flame retardant(S-IFR), LLDPE, flammabil-ity, Cone calorimeter