Plastics are a family of materials, each member of which has its own special characteristics. Being man-made raw materials, they are capable of being combined and formulated to give a wide range of properties to suit the end-use. They are synthetic materials, usually petroleum based. The major constituents are carbon and hydrogen, although nitrogen, chlorine, oxygen, silicone, and other elements may also be basic ingredients in some plastics. There are more than 40 basic families of plastics materials, each with its own unique characteristics.

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