The use of lightweight and high-strength composite materials to replace the existing metal structure is an effective way to reduce automobile exhaust pollution to achieve energy saving and emission reduction. The use of composite materials has the following advantages:
1). The composite car body can be made into any color, no additional painting is required, reducing the process;
2). The surface of the composite material plate has a gelcoat layer, which has good weather resistance. The painted aluminum plate has the risk of paint falling off;
3). The use of composite materials can reduce the weight of the body, and the weight reduction efficiency is at least 20% (the density of aluminum is about 2.7g/cm3, and the density of composite board is about 1.35g/cm3);
4) In the heat preservation of the car body, the thermal conductivity of the composite material is low, and the heat preservation performance is better;
5) Maintenance is more convenient. Once the body panel is damaged, it is easy to repair;
6) Composite material sheet is not corroded, the use of metal sheet will occur pitting or corrosion.

7) The replacement of aluminum with lighter composite materials is very key to reducing the weight of the car body, and the use of composite materials to replace metal sheets has been a new trend in the development of the international automotive industry.