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Medium alumina brick is a kind of neutral refractory materia. It’s made of bauxite or other raw matrials with high density alumina, by process of shaping and calcinating. 
 
Character: High purity alumina bricks is charactered by it high tempreture resistance above 1770℃,and with strong anti-slag ability.
 
Application: High purity alumina brick is mainly applied in building blast furnace, hot blast stove, electric furnace, reverberatory and the linings of rotary kilns. In addition, it is widely used as the regenerator checkers, casting system stoppers end, and nozzle bricks.
 

Specification

FIRE BRICK TECHNICAL DATA
Physical& Chemical analysis Fire clay brick Low-duty alumina brick Midum-duty alumina brick High-duty alumina brick Super-duty alumina brick
Brand SK34 SK36 SK38 SK40 SK42
Al2O3 / % ≦42 48~55 60~75 75 80
Fe2O3 / % 2.0 2.0 2.0 1.9 1.8
Apprent Porosity / % 24 22 22 22 22
Bulk Density /g·cm3  <2.2 2.2 2.3~2.5 2.65~2.7 2.7~2.8
Cold Crushing Strength/ Mpa ≧45 49 ≧50 ≧80 78.5
Refractoriness Under load 0.2MPa  1400 1470 1500 1530 1600
Permanent Linear Change / at 1450*2h 0 ~ -0.2 0.1 ~ -0.2 0~-0.2 0~-0.2 0~-0.1
Thermal shock resistance/ cycles / / 18 20 25
Refractoriness/   1610~1750 1610~1750 1770~2000 1770~2000 1770~2000
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