What is plastic foam called?

Plastic foam is called polymer foam, cellular plastic, or expanded plastic, with specific types named by plastic material such as polystyrene foam, polyurethane foam, polyethylene foam, and polypropylene foam, similar to different Packout box materials for different uses. Plastic foam is general term for foam made from plastic polymers with gas bubbles creating cellular structure, providing lightweight, insulating, and cushioning properties. Common plastic foams include expanded polystyrene foam called Styrofoam for cups and packaging, extruded polystyrene foam for insulation, polyurethane foam for mattresses and upholstery, polyethylene foam for packaging and padding, and polyvinyl chloride foam for construction. Plastic foam is also called foam plastic, cellular plastic, or sponge plastic, depending on density and cell structure, with open-cell foam having interconnected bubbles for soft cushioning and closed-cell foam having sealed bubbles for water resistance and insulation. So plastic foam called polymer foam or cellular plastic, with specific names like polystyrene foam, polyurethane foam, polyethylene foam, and PVC foam based on plastic used, widely used for packaging, insulation, cushioning, and construction due to lightweight and insulating properties.