Brand Specification	LMT76	LMT74	LMT72
Al2O3    ≥  %	76	74	72
MgO   ≥  %	14	12	10
C      ≥  %	8	8	7
Apparent porosity  ≤ %	8	9	10
Bulk density  g/cm3   ≥ %	2.90	2.85	2.80
Normal temperature Compressive strength (MPa) ≥  %	55	45	40
0.2MPa load soften beginning temperature ; ≥	1670	1630	1600