polystyrene
  • noun a type of plastic which can be made into hard lightweight foam by blowing air or gas into it, used as an insulating and packaging material
  • A clear, synthetic, water-resistant, and tough thermoplastic material which is made via the polymerization of styrene, whose chemical formula is C8H8. It is used, for instance, as an electrical and thermal insulator, as a dielectric, and in molded articles and packaging.

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