1, grinding is to rub the surface of the coated object or film with abrasive media such as sandpaper, pumice and fine stone powder.

Another use of grinding is the process of grinding off the damaged surface of the tire in a large area to expose a new rough surface, so that the new tread and the old carcass can be better combined.

2. Polishing is a processing method to reduce the surface roughness of workpiece by mechanical, chemical or electrochemical action to obtain a bright and flat surface.