Plastic

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Source: Oxford University Press

Term applied to many natural and synthetic materials with different forms, properties and appearances. They are all composed of large, usually carbon-based, molecules called polymers. The chemical composition of the polymers and the size and arrangement of their molecules determine the key properties of the plastic material. In addition to the base polymer most plastics have substances added to give colour, improve performance and facilitate manufacture.

D. Pullen

From Grove Art Online

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