First, the biggest advantage of applying plastics to automobile materials is to reduce the weight of the car body. Lightweight is the goal of the automotive industry, and plastics can show its power in this respect. In general, the specific gravity of plastic is 0.9 ~ 1.5, and the specific gravity of fiber reinforced composites will not exceed 2. In metal materials, the specific gravity of A3 steel is 7.6, brass is 8.4, and aluminum is 2.7. This makes plastics the first choice for lightweight cars

Second, the plastic injection partsis easy to form, which makes it very convenient to process parts with complex shapes. For example, when the instrument panel is processed with steel plate, it is often necessary to first process various parts, and then assemble or weld them with connectors, which has many processes. The use of plastic can be a molding, processing time is short, accuracy is guaranteed.

Thirdly, the elastic deformation characteristics of plastic molding products can absorb a lot of collision energy, which has a great buffer effect on strong impact and plays a protective role for vehicles and passengers。As a result, modern cars use plastic dashboard and steering wheel to enhance the cushioning effect. The front and rear bumpers and body trim strips are made of plastic materials to reduce the impact of objects outside the car on the sound of the car. In addition, plastic can absorb and attenuate vibration and noise, which can improve the ride comfort.

Fourth, plastic corrosion resistance, local damage will not corrode. Once the paint surface of steel is damaged or the early anticorrosion is not good, it is easy to rust and corrode. The corrosion resistance of plastics to acid, alkali and salt is greater than that of steel plate. If plastic is used as body covering parts, it is very suitable for use in areas with large pollution