It means the thickness of sandpaper, which is gradually refined from 60 # to 10000 # (the larger the number, the smoother the finer the number, the smaller the number, the coarser the sharper the grinding). To achieve the mirror effect, 5000 #, 7000 # and 10000 # sandpaper must be used as fine grinding.
1. 60#-180#: Belongs to coarse sand series, generally used for polishing hard/coarse things, such as metal/wood/wall etc.
2. 240#-400#: This is what we often use. It is used for secondary grinding. Some less demanding ones can be directly shaped.
3. 600#-1500#: Belongs to the fine range, used for mahogany furniture/amber/bodhi/gold, etc.
4. 2000#-5000#: Mainly used for polishing, can be used to remove dead skin, polish the surface of nails, etc.
5.7000#-10000#: It is used for professional mirror polishing. It adopts unique nano technology, and the surface particle size is relatively fine. It is used for fine polishing of products.