Brand		Burned bricks			Unburned Bricks
Item		DL-80	DL-75	DL-65	BDL-80	BDL-75	BDL-65
AL2O3 %		≥80	≥75	≥65	≥80	≥75	≥65
Refractoriness °C					≥1780	≥1780	≥1770
Refractoriness under Load °C		≥1530	≥1520	≥1520	≥1530	≥1520	≥1470
Permanent Linear Change % (1500°C×2h)		0.2~-0.4	0.2~-0.4	0.2~-0.4
Apparent Porosity %	For roof	≤19	≤19	≤22	≤18	≤18	≤21
	For corner	≤21	≤21	≤23	≤20	≤20	≤23
Cold crushing strength Mpa		≥75	≥65	≥58.8	≥60	≥55	≥30
Thermal shock resistance(cycles) (1100°C cold water)					≥8