What is plastic?

The main ingredient in plastic is crude oil. In a refinery, heavy crude oil is first separated into lighter groups called fractions. Plastic is derived from the fraction known as naphtha following several stages of processing and mixing. The chemical additives used in the process determine how pliable, hard or heat-resistant the end product will be. These additives include sulphur, oxygen and nitrogen. Sulphur is added to make plastic more pliable.

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