N1-1		N2-1		N3-1
		Spec	Typical	Spec	Typical	Spec	Typical
Chemical Analysis (%)	Al2O3	38¡Ü	40	32¡Ü	35	31¡Ü	33
	Fe2O3	2.5¡Ý	1.9	2.5¡Ý	2.0	2.5¡Ý	2.0
Refractoriness (SK)		34¡Ü	34	33¡Ü	33	32¡Ü	32
Bulk Density		2.00¡Ü	2.25	1.95¡Ü	2.20	1.90¡Ü	2.15
Apparent Porosity (%)		24¡Ý	19	24¡Ý	19	26¡Ý	19
Cold Crushing Strength		200¡Ü	400	200¡Ü	350	200¡Ü	350
(Kg/cm2)
Thermal Expansion (%)		-	0.56	-	0.52	-	0.53
at 1000¡æ
Permanent Linear Change (%)		-	0.5	-	0.5	-	1350¡æ 0.5
at 1400¡æ ¡Á 2Hrs
Refractoriness under Load		-	1,370	-	1,360	-	1,360
(2Kg/cm2, T2¡æ)