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Plastic - Wikipedia Plastics are a wide range of synthetic or semisynthetic materials composed primarily of polymers Their defining characteristic, plasticity, allows them to be molded, extruded, or pressed into a diverse range of solid forms
History and Future of Plastics - Science History Institute Plastic is a word that originally meant “pliable and easily shaped ” It only recently became a name for a category of materials called polymers The word polymer means “of many parts,” and polymers are made of long chains of molecules Polymers abound in nature