ITEM	FIRE CLAY
	DN-12	DN-15
Al2O3, %	≥45		≥42
Fe2O3,%	≤1.2		≤1.5
Apparent Porosity，%	≤12		≤15
Bulk Density，g/cm3	≥2.37		≥2.30
Refractoriness Under Load，T0.6	1500		1470
Refractoriness	1770		1750
Cold Crushing Strength，MPa	68		58.8
Linear Change after heating，%1400℃,2h	-0.1～+0.05		-0.2～+0