According to the use of plastics, the industry can be divided into general plastics, engineering plastics, and special engineering plastics.

General-purpose plastics: generally refers to common plastics with large output, wide application, good formability and low price, such as polyvinyl chloride, polyethylene, polypropylene, polystyrene, etc.
Engineering plastics: generally refers to good physical and mechanical strength, can maintain good mechanical, electrical, chemical and wear resistance, heat resistance and dimensional stability at high and low temperatures. It can replace the traditional Metal materials are used as structural materials for engineering. Such as ABS, polycarbonate, nylon, polyoxymethylene, modified polyphenylene ether, thermoplastic polyester and so on.
Special engineering plastics: refers to the characteristics of engineering plastics, its comprehensive performance is higher, long-term use temperature is above 150 ° C. It also has special functions and special uses. Such as fluoroplastics, silicones, polyetherimides, polyetheretherketones, liquid crystal polymers, and the like.