AbstractThe fire‐retardant effectiveness of mixtures of hexabromocyclododecane (HBCD) and artimony oxide (Sb2O3) in polyethylene (PE) was examined utilizing differential thermal analysis (DTA), gas chromatography/mass spectroscopy (GC/MS) and limited oxygen index (LOI) techniques. It was determined that the normal practice of mixing Sb2O3with HBCD induced a synergistic chemical reaction at 250°C whose main product, SbBr3, was responsible for enhanced fire retardancy. The mixing of SbBr3directly into the PE produces a superior fire‐retardant polyethy
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