Calcium aluminate is a series of inorganic compounds which are sintered at high temperature by calcium oxide and alumina. Due to its high hardness and high melting point, it is used in cement and fire extinguishing materials.The general formula is mCaO nAl 2 O 3, and the abbreviated form is CmAn (m, n equals 1).Calcium aluminate products are divided into three categories: water treatment, slag - making and high alumina cement.