Styrofoam is a material formed by adding a foaming agent to polystyrene (PS) and foaming it at high temperature, usually called "foam plastic". When heated and molded, it can be made into disposable tableware, fresh food trays, instant noodle bowls, hamburger boxes and other containers depending on the foaming ratio. It can also be used as a shockproof packaging pad, which is light and strong, but not environmentally friendly, and is gradually turning to paper packaging.