Abrasive
（重定向自Bonded abrasive）
![Grit size ranging from 2 mm (the large grain) (about F 10 using FEPA standards) to about 40 micrometres (about F 240 or P 360).](/Images/godic/202501/01/Differences_in_the_size_of_sand2759.jpg")
![Assorted grinding wheels as examples of bonded abrasives.](/Images/godic/202501/01/Grinding_Wheels2759.jpg")
![A grinding wheel with a reservoir to hold water as a lubricant and coolant.](/Images/godic/202501/01/Noe_schleifstein2759.jpg")
![A German sandpaper showing its backing and FEPA grit size.](/Images/godic/202501/01/Schuurpapier22759.JPG")
An abrasive is a material, often a mineral, that is used to shape or finish a workpiece through rubbing which leads to part of the workpiece being worn away. While finishing a material often means polishing it to gain a smooth, reflective surface, the process can also involve roughening as in satin, matte or beaded finishes.