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Polystyrene is one of the major thermoplastics with a high global demand ranking behind polyethylene, polypropylene, and polyvinylchloride.It is made from monomers of styrene, which is an aromatic hydrocarbon.There are four different varieties--clear, or so-called general purpose polystyrene (GPPS), impact modified polystyrene (IPS), more commonly called HIPS (high impact polystyrene, see Polymer Glasses, Fracture of: Factors Controlling Toughness), expanded polystyrene (EPS), and the recently introduced syndiotactic polystyrene (sPS, see Polystyrene: Syndiotactic).It is a synthetic polymer prepared by heating styrene in the presence of benzoyl peroxide by following a free radical mechanism.

Polystyrene is one of the major thermoplastics with a high global demand ranking behind polyethylene, polypropylene, and polyvinylchloride. Polystyrene film, rigid foam, and solid plastic are the three forms in which PS is available. In 1839, a German pharmacist Edward Simon accidentally discovered polystyrene, and a century later, it was used commercially. It is a homopolymer made up of only one type of monomer unit. It has many advantages, which makes it one of the most widely used plastics worldwide. It is used in making food service items, containers, cushions, trays, and many more products. There are four different varieties—clear, or so-called general purpose polystyrene (GPPS), impact modified polystyrene (IPS), more commonly called HIPS (high impact polystyrene, see Polymer Glasses, Fracture of: Factors Controlling Toughness), expanded polystyrene (EPS), and the recently introduced syndiotactic polystyrene (sPS, see Polystyrene: Syndiotactic). Polystyrene owes its high sales to good all round properties, easy processing and to an environmentally safe production. It is a synthetic polymer prepared by heating styrene in the presence of benzoyl peroxide by following a free radical mechanism. PS can be used as a symbol to represent polystyrene. It is made from monomers of styrene, which is an aromatic hydrocarbon. At room temperature, it exists as a solid. It is a non-toxic, widely used plastic, and millions of tons of polystyrene are produced per year