The model and mesh number of commonly used sandpaper are the same, that is, the larger the label of sandpaper, the more the mesh number, and the finer the sandpaper; The smaller the label, the less mesh and the finer the sandpaper. Generally, the label of sandpaper is 30, and the fineness is 30 mesh. No.60, fineness of 60 mesh. No.400, fineness of 400 mesh.
According to the purpose:
Dry sandpaper (wood sandpaper) is used to polish the surface of wood, bamboo, metal or other objects; Water-resistant sandpaper (water sandpaper) is used to polish metal or nonmetal workpieces and surfaces in water or oil.
According to the commodity name:
Wood sandpaper, that is, dry frosted paper; Water-resistant sandpaper, that is, water-resistant sandpaper; Iron sand cloth, a kind of dry frosted paper, is relatively thick and can polish the metal surface as soon as possible.