Alumina
Alumina, a white crystalline powder, is manufactured by burning aluminum hydroxide. The basic chemical formula is Al2O3 and it is the most stable and widely used typical alpha alumina. It is widely used for refractories, insulation, ignition plugs, IC substrates, abrasives, and polishes as it has high melting temperature, high Morse hardness, high electrical resistance, and stable in acid and alkali.