EFFECT OF TRIARYL PHOSPHATE, ZINC AND ZINC BORATE ON FIRE PROPERTIES OF HIGH-IMPACT POLYSTYRENE AND HIGH-IMPACT POLYSTYRENE-POLYPHENYLENE OXIDE BLEND (MODIFIED-POLYPHENYLENE OXIDE)

Samples of m-PPO (virgin and flame retarded) and high impact polystyre ne blended with zinc and zinc borate (2ZnO.3B2O3.3.5H2O), were prepare d. The effect of triaryl phosphate on the flame retardancy of PPO-HIPS in conjunction with zinc and zinc borate was studied. For polystyrene zinc borate shows some reduction in smoke generation. Zinc, however d oes not show any effect on smoke generation for high impact polystyren e. Triphenyl phosphate shows minimal flame retardancy in HIPS which is not enhanced by zinc. Addition of zinc gives an increase in oxygen in dex for FR m-PPO, whereas zinc borate decreases the OI values. Zinc bo rate may sequester triaryl phosphate and thus eliminate its vapor phas e activity. Zinc borate shows a significant reduction in smoke generat ion and rate of heat release for m-PPO.