Common Fused Magnesite Introduction It is an ideal raw material for producing firebrick and monolithic materials, with the characteristic of big crystal,compact texture,high temperature property and high slag resistance. Specification No. MgO SiO2 CaO B.D (g/cm3) 1. 98 0.6 1.2 3.5 2. 97.5 0.7 1.4 3.48 3. 97 1.5 1.5 3.45 4. 96 2.2 2.0 3.40