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XLPE insulation material is very commonly used in electrical cable industry. Due to the highly level flammability of XLPE which have low value of Limiting Oxygen Index (LOI) between 18-19% make this material requires improvement. Antimony trioxide (Sb2O3) is very commonly used as a flame retardant additive in PVC material, will be used to increase the LOI value of XLPE. By applying the composition of Sb2O3 with the variation of 2%, 4% and 6%, we found that the LOI value increased to up to 22%. The negative effects should be aware because we also found that addition of Sb2O3 on XLPE materials led to a decrease in the value of the electrical resistivity by 1 order.