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Corundum Castable
Al2O3 Content (%): 75~95%
CaO Content (%): 1.2~2.5%
SiO2 Content (%): 2~20%
MgO Content (%): 5~15%
Refractoriness (Degree): Common (1580°< Refractoriness< 1770°)
Product Information
Corundum castable is mainly made from corundum aggregate, corundum powder and some adhesives. Compared with high alumina and mullite refractory castables, corundum castable has higher mechanical strength and resistance of erosion and abrasion, but a little lower thermal shock resistance.
| Performance | Item | Indicators |
| Chemical composition after calcination（%） | SiO2 | 9.5-14.0 |
| Al2O3 | 85.0-95.0 | |
| Alkalis | <0.4 | |
| CaO | <0.4 | |
| Fe2O3 | <0.4 | |
| TiO2 | <0.4 | |
| Physical properties | AP（%） | 14-17 |
| BD（g/cm3) | 2.8-2.93 | |
| CCS （Mpa） 816℃ 1400℃ | 46.5-57.4 96.1-113.0 | |
| Applied limit temperature℃ | 1790 | |
| Linear change on reheating（%） | -0.1 ～ 0.1 | |
| Water content（%） | 0 |
The castable has good abrasive resistance and mechanical strength, little pollution to glass products and good plasticity during construction.
Corundum castable is mainly applied in lining materials in boiler, blast furnace, hot blast furnace, heating furnace, ceramic furnace and other kinds of furnace. Glass furnace is mainly used in high temperature environment, such as flame space, brick hook, small furnace structure, end wall and so on.
