Today, polystyrene which is also known as Styrofoam is among the most heavily used commodity thermoplastics. This resin is a petroleum-based plastic made from the styrene monomer. Polystyrene is a light-weight material, about 95% air and has very good insulation properties. High molecular weight thermoplastic resins are generally produced by the free-radical polymerization of styrene monomer which can be initiated by heating alone but more effectively by heating in the presence of free-radical initiator (such as benzoyl peroxide). Typical processing techniques are modified mass polymerization or solution polymerization, suspension polymerization, and expandable beads for foam.
Packaging and foodservice products, automotive parts, toys, house wares, appliance parts, wall tiles, radio and TV housings, furniture, floats, and luggage.