brand	High alumina
Item	LZ-75	LZ-65	LZ-55	LZ-48
AL2O3, %          ≥	75	65	55	48
Refractoriness，℃	1790	1790	1770	1750
0. 2MPArefractoriness under load，℃≥	1520	1500	1470	1420
Permanent linear change after heating，%1500℃, 2h                                         1450℃, 2h	+0. 1		-
	-0. 4
	-		+0. 1
			-0. 4
Apparent porosity        %≤	23	23	22	22
Cold Crushing Strength，MPa≥	53. 9	49. 0	44. 1	39. 2