ALUMINA BUBBLE  
     
 
 
     
 
The alumina bubble is a hollow spherulitic heat-insulating material, which is made by electro fused method. It is noted for its light-weight, heat-resistance and close pore. It is an ideal filler for high -temperature furnaces and excellent aggregate of light weight cast able refractory. And it is an ideal heat-insulating and energy-saving refractory in high temperature.
 
     
  PROPERTIES :  
 
Properties
Figures
Chemical composition(%)
Al2O3
≥95
SiO2
≤0.5
Max service temperature (°C)
1800
Bulk density after burnt at 1500 °C(g/cm3)
1.35-1.40
Linear changes after burnt at (1500°C×3h)(%)
±0.5
Compressive / bending
strength (MPa)
110 °C×24h
≥8 /≥3
1100 °C×3h
≥15/≥4
1500 °C×3h
≥20/≥6
Max particle size of bubbles(mm)
5
Water content for construction (%):
9-12
Thermal conductivity coefficient(w/m)
0.7-0.8
Size
0.1-5.0mm(or in mesh size)
Packing density
0.45-1.0g/cm3
Main crystalline
a-Al2O3
Packing
25 kg bags or 1000 kg bags
 
     
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