The Magnesium Oxide Powder is white and is specially made for MgO board. It has loose texture and high reactivity. It is really green fire prevention product without such harmful elements as asbestos, formaldehyde or benzene. Benefits: (1)fireproof (2)waterproof and moisture proof (3) heat preservation and protection (4) sound absorption and insulation (5)light quality and high intensity (6) green environment protection General Description Molecular formula: MgO Molecular weight: 40.3 CAS No.: 1309-48-4 EC No.: 215-171-9 H.S. Code: 251990 We can supply different MgO grades from 80%~92% with different sizes. ITEMS SPECIFICATIONS MGO 90% MIN SIO2 5.5% MAX CAO 2.5 MAX FE2O3 1.0 MAX AL2O3 1.0 MAX SIZE 200 MESH PASSING RATE: 90% COLOR WHITE