High-Purity Dead Burned Magnesite is made from finely selected grade-A raw magnesite through processes of floatation concentration, calcination, milling, briquetting, and sintering in ultra-high temperature oil shaft kilns. It is the excellent material for making magnesia brick and magnesia monolithic refractories. Physical and Chemical Specifications Items MgO% >SiO2%< CaO%< Fe2O3%< lgL%< B.D>(g/cm3) Grain Size (mm) DBM-98.00 97.70 0.50 1.20 0.50 0.30 3.30 0 - 30 DBM-97.50 97.50 0.60 1.20 0.70 0.30 3.27 DBM-97.00 97.00 0.70 1.40 0.80 0.30 3.25 DBM-96.00 96.00 1.00 1.40 0.80 0.30 3.20 0 - 40