The chemical resistance test method mainly refers to the brake pads in some specific chemicals. The requirements to be achieved in the immersion. Take GM as an example, it requires brake pads To perform solvent resistance test of protective coating, when the brake pad is at room temperature, enter the solvent After 24 hours, the coating should not dissolve, loose or stratify. These solvents have Isopropyl alcohol, brake fluid, mineral oil, etc.