Plastics are an important organic synthetic polymer material and are widely used. But the "white pollution" caused by waste plastics is becoming more and more serious, if we can understand the composition and classification of plastics in detail, not only can help us to use plastic products scientifically, but also conducive to the classification and recovery of plastics, and effectively control and reduce "white pollution."

Most plastics are light, chemically stable and do not rust;

good impact resistance;

It has good transparency and wear resistance.

Good insulation, low thermal conductivity;

General formability, good coloring, low processing costs;

Most plastics have poor heat resistance, large thermal expansion rate, easy to burn;

Poor dimensional stability, easy to deform;

Most plastics have poor low temperature resistance, brittle at low temperature and easy to age;

Some plastics are soluble in solvents.

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