HIPS is a modified material of PS, with a brittle temperature of around -30 ℃, a glass transition temperature of 80-105 ℃, a melting temperature of 140-180 ℃, and a decomposition temperature of over 300 ℃. The material contains 5-15% rubber components, which increase its toughness by about four times compared to PS and greatly enhance its impact strength. It has the advantages of PS with molding processing and strong coloring power. HIPS has low water absorption and does not require pre drying during processing. HIPS is a milky white opaque bead or particle that can be colored arbitrarily, has good rigidity, is easy to process and shape, and has a low strength that is more than 7 times higher than GPPS. The impact strength varies depending on the rubber content, and can generally be divided into several levels: impact resistance and ultra-high impact resistance. As the impact strength increases, its tensile strength and transparency decrease. Mainly used as packaging materials, such as food, cosmetics, daily necessities, mechanical instruments and stationery packaging, etc; Multiple processing methods can be used for molding. Low permeability but high breathability, suitable for moisture-proof packaging.