Magnesia-alumina brick Mg-Al brick takes MgAl2O4 and periclase as the main raw material, therefore, has higher high-temperature strength, good thermal stability and corrosion resistance of strong alkaline slag. Properties Magnesia-alumina brick Magnesia-alumina spinel brick Periclase-spinel brick High magnesia-Alumina brick SML -80A SML-80B SMJ-A SML-B SML-C SPJ -80A SPJ-80B SCML-86 Mgo,% 80 80 80 75 70 82 80 86 AL2O3,% 5-10 5-10 8-15 8-15 8-15 5-10 5-10 5-10 The initial temperature of beginning softens at 0.2Mpa load,¡æ¨R 1600 1580 1700 1650 1600 1620 1600 1700 Cold crushing strength,Mpa ¨R 45 40 35 35 35 40 40 35 Abscess,%¨Q 18 20 17 18 19 18 18 16 Thermal stability ( 1100¡æ,water-cooled)times ¨R - - 20 15 10 7 5 -