[GENERAL INFORMATION]

α-­β Al2O3 refractories are composed of alpha alumina, beta alumina and small amount of glass phase, showing excellent performance in resistance to corrosion of molten glass and prevention of staining molten glass as a combination of respective 50% α Al2O3 and β Al2O3.

β Al2O3 refractories are composed of beta alumina and little glass phase, characterized with better resistance to corrosion of alkali vapor. It can be used in places where there has frequent great change in temperature, due to its high thermal shock resistance.
Both α-­β Al2O3 and β Al2O3 refractories are the best choices in glass furnace construction.

[ADVANTAGE]

[α­-β Al2O3]

* Dense microstructure;

* Excellent resistance to corrosion of molten glass;

* Low defect potential to molten glass;

[β Al2O3]

* Excellent resistance to corrosion of alkali vapor;

* Little glass phase;

* High thermal shock resistance;

[APPLICATION]

INDEX α-­β Al2O3

* Pavers of cooling end;

* Feeder channel;

* Sidewall of cooling end;

* Feeder channel;

INDEX β Al2O3

* Superstructures of melters end;

* Port crown;

* Rear breast walls;

[TECHNICAL DATA]

INDEX α­-β Al2O3 & β Al2O3

* Al2O3, % ≥ 94; 93 ­ ­

* SiO2, % ≤ 1.80; 0.50

* Na2O + K2O, % ≤ 3.70; 6.00

* Bulk density, (g/cm3) ≥ 3.40; 3.05

* Apparent porosity, ≤% 2.0; 10.0

* C.C.S., Mpa ≥ 200; 30

* Bubbling tendency, (%,1300℃×10hr)
0­ 1000℃×10hr

* Anti-corrosion rate of glass liquid,
(mm/24hr)
＜ 0.3 1350℃×10hr ­