What is High Impact Polystyrene (HIPS)? High-impact polystyrene (HIPS) is a versatile thermoplastic resin renowned for its excellent impact resistance, stiffness, and ease of processing. This material is a modified version of standard polystyrene, created by incorporating rubber particles—typically polybutadiene—into the polymer matrix. This modification enhances its toughness while maintaining clarity and an aesthetically pleasing