Zirconium Alumina Zirconium Alumina is an abrasive material produced by electrofusing zirconium and alumina raw materials in an electric arc furnace, and then by quenching, crushing and sieving the fused mineral into selected grain sizes. Zirconium Alumina has small crystal size and a unique microstructure, which give it excellent toughness, hardness, cutting capacity, and durability. Depending on the application, Zirconium Alumina is often far superior to brown fused alumina, silicon carbide and other traditional abrasive materials.