Plastics. A plastic is a substance which can be shaped or moulded. The Raw Material for plastics is Crude Oil. Plastics are types of polymers. Polymerisation.
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Polymers that soften on heating and Harden when cooled are called Thermoplastic. Examples are Polythene, PVC, polypropene etc.
Some polymers are largely unaffected by heating. These are known as Thermosetting Polymers. Their Structure is such that they contain Cross-Links between the long polymer chains. Examples are Bakelite and Mica.