High Impact Polystyrene sheets, also referred to as HIPS Styrene Sheets, is considered an industry standard thermoplastic. It is a stiff, tough plastic material that is widely used in the creation of models and lower heat applications. Styrene Sheets (HIPS Sheet) is a low cost, odourless, and non-toxic plastic sheet is used for indoor signs and lithographs, prototypes, packaging, and toys. High Impact Polystyrene sheets are fully recyclable.