Engineering plastics are plastics used as engineering structural materials. Although engineering plastics are more expensive, they often have some unique superior properties. For example, it has higher heat resistance, impact resistance, fatigue resistance than general plastics, wear resistance, acid and alkali resistance, excellent stability at high and low temperatures, or The performance of certain metals and so on. Compared with metal, engineering plastics are easy to form (can be formed at one time), are easy to process, and easy to assemble. In addition, the main raw materials for synthetic engineering plastics are petroleum, coal and natural gas, which are rich in raw materials and low in price compared to metals. Therefore, engineering plastics are getting more and more attention in the development and application.

The main varieties of engineering plastics are polyamide (ie nylon), polyoxymethylene, polycarbonate, polyester, polysulfone and the like. Most of them are high-performance resins. For example, polycarbonate is a high impact-resistant transparent material that can withstand temperatures up to 145 degrees, so it can be used to make skylights on supersonic aircraft. POM has high rigidity, high hardness, low friction coefficient and Good resistance to fatigue and other characteristics, so it is commonly used to manufacture bearings, bushings and precision pinions. In the environment in which we live and learn, engineering plastics have also been widely used in high-end products such as microcomputers, video recorders, air conditioners, and cameras. From a global perspective, the amount of engineering plastics is increasing rapidly every year, and the fields and products involved are increasing.