High Fired Magnesia Brick Specification : Technical specification: MgO 94.5 % SiO2 : 2.5 % max. Al2O3 1 max Fe2O3 1 % max CaO : 2 % max Bulk Density (g/cm3) : 2.95 R.U.L 1600 0C Apparent Porosity (%) : 15 Cold crushing strength : 500 kg/cm2 min Tolerance I Size : 230 x 114 x 64mm 230 x114 x 59/69mm 230 x 114 x 56/72mm we also offer all sizes