The most commonly used synthetic abrasive is aluminium oxide. It is a hard, white, crystalline solid that is used in a variety of abrasive products, including sandpaper, grinding wheels, and polishing compounds. Aluminium oxide is also used in some ceramics and as a refractory material.
Boric acid is a white, odorless, crystalline solid that is used in a variety of applications, including as a flame retardant, a flux in soldering, and a topical treatment for eye infections. Boric acid is also used in some cosmetics and as a pesticide.
Silicon is a non-metallic chemical element that is the second most abundant element in the Earth’s crust. It is used in a variety of products, including semiconductors, glass, and ceramics. Silicon is also used in some construction materials and as a lubricant.
While all of these materials are abrasive, aluminium oxide is the most commonly used synthetic abrasive.