Grit Size

Coarser grits have smaller grit size numbers and remove high volumes of material, while finer grits have larger grit size numbers but remove a smaller amount of material. For example, a coarse grit for rapid material removal or large dimensional changes would be around 40. Very fine grit for sanding between coats of paint and creating a fine surface finish would be around 240, while ultra-fine grit for final sanding and polishing would be around 1000.

P-graded abrasive grains are held to a closer tolerance than non-P-graded abrasives. This means that P-graded abrasives offer a more consistent surface finish, but the grit size will still be a number which indicates coarseness or fineness. For example: P100 will be a medium grit, with a more consistent surface finish than an equivalent medium, 100-grit abrasive.