alpha-beta alumina block is the compact structure formed form alpha-Al2O3 and beta-Al2O3  crystal in a most ideal proportion. It has good erosion resisting and good stability. Its feature is that when touching melting glass, it produces little concretion and bubbles. So, α-β alumina block may be widely used to the parts of touching melting glass like work pond and passage, and may be also used to the upper structure including crown.

Typical Chemical Composition:

Al2O3 94%       

NaO2   4%       

SiO2+Fe2O3+TiO2+CaO   2%

 

Typical Crystallographic Analysis:

alpha alumina 45% 

beta alumina 53%   

Vitreous Phase 2%

 

Typical Physical Properties:

True Specific Gravity: 3.54g/cm3 

Cold Crushing Strength >200MPa 

RUL(0.2MPa) >1700°C

Volume Density(Void free): 3.2g/cm3