THE EFFECTS OF ANTIMONY(III) OXIDE AND BASIC IRON(III) OXIDE ON THE FLAMMABILITY AND THERMAL-STABILITY OF A TERTIARY POLYMER BLEND

The effects of antimony(III) oxide (flame retardant) and basic iron(II I) oxide (smoke suppressant) on the thermal stability of a tertiary bl end containing ABS (acrylonitrile-butadiene-styrene), PVC (poly(vinyl chloride)) and PP (poly(propylene)) have been investigated. As found i n earlier work on a two-component system of ABS and PVC, the basic oxi de of iron has a marked stabilizing effect on the thermal degradation of the polymer blend; however, antimony(III) oxide has a marked destab ilizing effect. Two flammability parameters, namely LOI (limiting oxyg en index) and smoke production are also reported.