Brand name	brick compound	Corundum composite brick	Mullite brick corundum
Item	XK-75	XKSGL	XKGML
Al2O3 %	≥75	≥82	≥85
SiC %	≥13	≥12
Fe2O3 %	≥1.0		≥0.6
Refractoriness ℃		≥1790	≥1790
Bulk density g/cm3	≥2.90	≥3.1	≥3.0
AP %	≤15	≤13	≤16
Cold crushing Strength Mpa	≥100	≥120	≥95
Flexural strength Mpa		≥30	≥22
CCS ℃	≥1660	≥1680	≥1680
Seize Line changes（1500 ℃*3h）%	0~+0.2	0~+0.2	0~+0.2

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