Damping sheet, also known as mastic or damping block, is a kind of viscoelastic material attached to the inner surface of the car body, clinging to the steel plate wall of the car body, mainly for the purpose of reducing noise and vibration, that is to say, damping. All cars are equipped with damping plates, such as Mercedes Benz, BMW, Toyota, Cadillac and other brands of cars. It is widely used in aerospace vehicles, airplanes and other machines that need shock absorption and noise reduction. In the automotive industry, the use of damping materials enhances the car's airtightness, reduces vibration, reduces noise, and improves the car's comfort;