Magnesia bricks are basic refractory bricks. Its magnesia content is from 92% to 97.7%, and cristobalite is as the main crystal se.Magnesite bricks are generally divided into bonded magnesia refractory bricks and chemical combination magnesia bricks.Magnesia bricks have exnt performance of resistance to alka,so this kind firebricks are widely used in glass industry, cement industry,steel and ironindustry,etc.