Brand Specification	AM90	M85	M90	M95
Al2O3    ≥  %	15	-	-	-	-
CrO2     ≥   %	-	-	-	-	5
MgO   ≥  %	75	85	90	95	90
SiO2      ≥  %	2	-	3	3	-
Apparent porosity  ≤ %	15	14	8	7	12
Bulk density  g/cm3   ≥ %	2.90	2.95	2.95	3.05	3.00
Compressive strength (MPa) ≥%	60	60	50	50	80
High temperature bending strength (MPa) (1400*0.5h) MPa ; ≥	6	7	8	12	12