MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Expanded polystyrene products. Polystyrene is a thermoplastic substance that melts if heated and becomes solid again when cool. It can be cast into moulds and made to take on various colours. One form is expanded polystyrene foam. This is used in packing materials and foam drinks cups. In this form, polystyrene's properties include insulation, flexibility, and shock absorption.
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