Brand Specification	ZTAM-60	ZTA-70	ZTM-80	HBL-94	HBLMT	HBLGT
Al2O3    ≥ %	80	90	-	94	55	80
MgO   ≥  %	12	-	90	-	8	ZrO2≥3
C     ≥  %	-	-	-	-	8	3
Apparent porosity ≤%	15	15	16	18	10	9
Bulk density g/cm3  ≥%	3.0	3.1	2.9	3.0	2.9	3.1
Compressive strength (MPa)	80	100	100	85	-	-