Guarantee	Chemical Composition (%)				Apparent Porosity (%) ≤	B.D	Strong pressure at room temperature	0.2Mpa refractoriness under load start temperature (℃) ≥	1100 ℃ water-cooled thermal shock resistance≥
						(g/cm3)	(Mpa)≥
Brand	MgO	Al2O3	SiO2	Fe2O3		≥
	(%)≥	(%)≤	(%)≤	(%)≤
HMJ-75A	75	13	0.6	0.8	17	2.95	45	1700	10
HMJ-75B	75	13	1	0.8	17	2.95	45	1700	10
HMJ-80	80	9	1.5	0.8	16	2.95	45	1700	10
HMJ-85A	85	9	0.6	0.7	17	2.95	45	1700	12
HMJ-85B	82	9	2.5	0.8	16	2.95	40	1700	10
HMJ-93A	88	5	0.6	0.7	16	2.95	45	1700	12
HMJ-93B	85	5	2	0.8	17	2.95	40	1700	10
HMJ-95A	93	3	0.6	0.7	16	2.95	45	1700	12
HMJ-95B	90	3	2.5	0.8	17	2.95	40	1700	10