Project	Unfired brick	average particle size(um)			Blast furnace brick
		DL-80	DL-75	DL-65	GL-65	GL-55	GL-48
Al2O3(％)	≥75	≥80	≥80	≥65	≥65	≥55	≥48
Fe2O3(％)					≤2.0	≤20	≤2.0
Refractoriness 　　　　℃	≥1770	≥1790	≥1790	≥1790	≥1790	≥1770	≥1750
apparent 　　porosity ％	≤21	≤19	≤19	≤22	≤19	≤19	≤18
normal temperature and pressure(Mpa)	≤21	≥78	≥68	≥58	≥58	≥49	≥49
0.2Mpa Load 　softening　temperature	≤21	≥1550	≥1530	≥1520	≥1500	≥1480	≥1450
Reheating linear change(％)		0～-0.3 1500℃×2h	0～-0.4 1500℃×2h	0～-0.3 1500℃×2h	0～-0.3 1500℃×2h	0～-0.3 1500℃×2h	0～-0.3 1500℃×2h