properties:white power,adorless,insoluble in water,soluble in acid and alkali,turn into yellow color when heated above 30.C,melting point is 1800.C,became a sublimation and can sbsorb carbon dioxide in normal pressure. CAS No.: 1314-13-2 Melting Point: 1975℃ EINECS: 215-222-5 Density： 5.606 usage:rubber making;ceramic industry;glass industry;midicine and hygiene;pigment industry;cosmetic field and so on.