We are offering calcium silicide. calcium silicide (casi2), also called calcium disilicide, is an inorganic compound, a silicide of calcium. It is a whitish or dark grey to black solid matter with melting point 1033°c. It is insoluble in water, but may decompose when subjected to moisture, evolving hydrogen and producing calcium hydroxide. Decomposes in hot water. It is flammable and may ignite spontaneously in air.