Unmodified general-purpose polystyrene is an amorphous polymer which is hard and brittle, but it has good electrical properties, aging resistance and high dimensional stability. The disadvantage is high brittleness and sensitivity to environmental stress cracking. The addition of ultrafine talc powder can improve the impact toughness, adjust the rheology, significantly increase the modulus of the distortion, and improve the tensile yield strength. For example, adding 40% ultrafine talcum powder or talcum powder masterbatch, the disturbing modulus is increased by 58800kg/cm2 from 23800kg/cm2, and the tensile strength is increased by 385kg/cm2 from 336kg/cm2.
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