Brown aluminum oxide abrasive is electrically fused in an arc furnace from a mixture of bauxite, coke (anthracite) as main material at high-temperature
Its microhardness: 1,800 to 2,200
Toughness: higher than silicon carbide
Abrasive articles made of it are suited for grinding metals of high-tensile strength such as steel, annealed malleable and hard high-class refractory products
