Specifications

Alumina bubble Bricks
1.high temperature resistance
2.low thermal conductivity
3. good thermal insulation

Alumina bubble Bricks

 They are widely used in inner linings of various non-contacted melt high temperature kiln and thermal insulating layers of high temperature kilns.

Physical and Chemical Indexes of Hollow Alumina Sphere Bricks
Name / Indexes/ Item		MLQ-1.5	LQ-1.2	LQ-1.5	LQ-1.7
Chemical composition	Al2O3 % ≥	84	98.5	98.5	98.5
	Fe2O3 % ≤	0.8	0.3	0.3	0.3
	SiO2 % ≤	15	1.0	1.0	1.0
Bulk density g/m3≤		1.5	1.2	1.5	1.7
Compressive strength at normal temperature MPa≥		16	3	12	15
Porosity % ≥		58	62	60	58
Soften point at 0.1MPa KD°C≥		1650	1650	1700	1700
Fire resistant (°C)≥		1800	1800	1800	1800
Thermal conductivity Hot side 1000°C W/m.k≤		1.2	0.95	1.05	1.15