EPS raw material expandable polystyrene is a white beaded thermoplastic resin containing foaming agent, which will expand to form a porous foam structure after heating. Its core features are: light weight, extremely low density, and much less weight than wood or metal in the same volume. With good heat insulation, the air inside foam can effectively block heat transfer, and is often used as insulation material. Strong cushioning and porous structure can absorb impact, making it a commonly used material for packaging electronic products and household appliances. The inner lining of helmets used in daily life is also made of EPS.