… Polymers of styrene, in primary forms. …
Explanatory notes
… polystyrene is a colourless, transparent, thermoplastic material which finds extensive use in the electrical and … of foodstuffs and cosmetics. It is also used in the manufacture of toys, clock cabinets and gramophone records. … good mouldability and chemical resistance, are used for making cups, tumblers, typewriter keys, refrigerator parts, …