Polystyrene is a synthetic polymer made from styrene monomer, which is a liquid petrochemical. It is a thermoplastic polymer which softens when heated and can be converted via semi-finished products, such as films and sheets, into a wide range of final articles.

Polystyrene can be rigid or foamed. General purpose polystyrene is clear, hard and brittle. Polystyrene is naturally transparent, but can be coloured with colorants.

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