1. Plastic no corrosion problem, in the case of rubbing, even if the paint was rub off, do not worry about rust. If there is a problem with metal materials.
2. Lightweight requirements, the heavier the car, the higher the fuel consumption, so even now there are depots are made of plastic car, such as Smart.
3. pedestrian protection, if the bumper using high-strength materials, then hit the person in case, the calf directly to the waste, the relative impact of plastic to be smaller.