“Lightweight” and “environmental protection” are eternal topics in the field of vehicle materials. In recent years, plastics and composites have become more and more popular in car manufacturing due to excellent characteristics in terms of lightweight, beautiful appearance, anti-corrosion, and design flexibility. Whether in interiors & exteriors, or functional and structural parts, the shadows of plastics and composites can be seen everywhere. The application feature of exteriors is “plastic instead of steel”, to reduce the weight of vehicles. Exteriors parts include bumpers, fenders, wheel covers, deflectors (aerodynamic panels), etc.. Interiors mainly refer to the dashboard, inner door panel, auxiliary dashboard, glove box cover, seats, rear guard panels and so on.