Dead burned magnesite is selected from natural magnesite, it is produced by mine selecting, purifying, calcining in shaft kilns. It is an ideal material for unshaped refectory material, the final products are used in opening hearth furnace, electric furnace bottom furnace lining tamping. 
DBM-90 
MGO 90%MIN. SiO2 5.0%MAX. CaO 1.6%MAX. LOI 0.3%MAX. B. D3.10-3.15g/cm3 
DBM-91 
MGO 91%MIN. SiO2 4.0%MAX. CaO 1.6%MAX. LOI 0.3%MAX. B. D3.10-3.18g/cm3 
DBM-92 
MGO 92%MIN. SiO2 3.5%MAX. CaO 1.6%MAX. LOI 0.3%MAX. B. D3.10-3.18g/cm3