High refractoriness, good heat-resistant ability and the chemical stability is good under the reducing atmosphere. The application temperature is 1350~1500℃, and the high pure product's application temperature may reach 1650~1800℃.
 High quality of high alumina insulation brick can be used as the linings that directly contact the fire however it can not be used in the place where eroded by slag directly. Because the high alumina insulation brick is of good stability under reduction condition it is widely used as the inner insulation layer in the furnace that protected by hydrogen or carbon monoxide atmosphere.
 1. Main Characters: High refractoriness, low density, high cold crushing strength and low thermal conductivity, make it save the industrial furnace’s energy very much.
 2. Applications:
High alumina insulation brick is widely used to build the thermal insulating layers of many kilns and
 the linings of industrial kilns, which working temperature is less than 1350℃.
 3. Physical and Chemical Index:

Item	Index
	LG-1.0	LG-0.9	LG-0.8	LG-0.7	LG-0.6	LG-0.5	LG-0.4
AL2O3，%				≥48
Fe2O3 , %				≥2.0
Bulk Density, g/cm3	≤1.0	≤0.9	≤0.8	≤0.7	≤0.6	≤0.5	≤0.4
Cold Crushing Strength MPa Standard	≥3.9	≥3.4	≥2.9	≥2.5	≥2.0	≥1.5	≥0.8
Test temp linear change within 2％on reheating	1400	1400	1400	1350	1350	1250	1250
Thermal conductivity （350±25℃）W/m.k	0.50	0.45	0.35	0.35	0.30	0.25	0.20

Explained: The operating temperature cannot surpass the test temperature

Item		Index
		LG-1.3	LG-1.0	LG-0.8	LG-0.6
AL2O3，% Min		48	48	48	48
Fe2O3，%, Max		2.0	2.0	2.0	2.0
Bulk Density, g/cm3 Min		1.3	1.0	0.8	0.6
Cold Crushing Strength MPa	Standard		3.9	2.9	2.0
	Test Value	8.0	4.5	3.5	3.0
Test temp linear change within 2％on reheating		1450	1400	1400	1350
Thermal conductivity （350±25℃）W/m.k		0.60	0.50	0.35	0.30