There are two types of damping plate materials: one is the damping plate made of asphalt. There are many reports about air pollution in the car. Many car owners report that there will be an unpleasant smell in the car. In fact, this is the fault of the asphalt damping plate. What is the asphalt damping plate? Asphalt damping sheet is actually made of asphalt as the raw material to reduce noise and vibration on the car. If the asphalt damping sheet meets the high temperature inside the car, it will degrade and release harmful substances and unpleasant smell to human body.