ITEM	High-alumina Firebricks for steel Ladle
INDEX	CL-55	CL-65	CL-75	CL-80	PZCL-78
Al2O3 %≥	55.0	65.0	75.0	80.0	78.0
Fe2O3%≤	-	-	-	2.0	2.0
0.2MPa refractoriness under load，℃≥	1470	1490	1510	1530	1550
Linearchangeafterheating%1450℃2h                1500℃2h                     1550℃2h	0.1-0.5	-	-	-	-
	-	0.1-0.5	0.1-0.5	-	-
	-	-	-	0.1-0.5	0.4-0.3
Apparent Porosity，%≤	22	28	28	24	21
Cold Crushing Strength，MPa≤	45	35	40	50	70