The impact-resistant polystyrene is made by adding polybutadiene rubber to HIPS which is non-toxic and environmentally friendly. It is often used in the food and packaging industries. Compared to GPPS, HIPS has a high rubber content and a high impact resistance. When subjected to impact, the stress of crack expansion is released by the soft rubber to improve impact resistance. Another advantage is heat resistance. HIPS can be used for vacuum forming, printing, cutting, injection, extrusion, and other processing, and can be used in a variety of product shapes. Good processing characteristics and competitive prices make the material popular.