The plastic raw material is a polymer, which is also called polymer or polymolecular, also commonly known as plastic or resin. The so-called plastic, it is in fact a kind of synthetic resin, the shape with the natural resin of pine resin in the similar, but has the power to synthesize chemically.So it is called plastic.

This polymer is a combination of many small, simple structures that are covalently bonded. There are many types of polymers, and generally they can be classified into two types according changes in heat.