Calcined alumina is produced by calcining ("heating") the alumina at various temperatures. Combined with state-of-the-art process control equipment, we can produce a range of high grades of alpha alumina with controlled soda chemistry, surface area, and divided size distributions.
It has high hardness and resistance to compression, wear resistance, chemical inertness, high degree of refractoriness and melting point, superior electrical insulation properties, resistance to thermal shock, dielectric properties.
Refractories
Weight composition analysis%
Index
Al2O3
≥ %
Fe2O3
≤ %
Na2O3
≤ %
SiO2
≤ %
Ture density
≥ g/cm3
L.O.I
≤ %
Primary crystal size
μm
Typical value
99.3~99.5
0.02~0.05
0.2~0.4
0.05~0.15
3.93~3.96
0.1
1~4
Available sizes:
325mesh, 500mesh, 800mesh, 5μm, 3μm, 2μm, 1μm.
Other specifications are also available upon request
It can be used for formless refractories (all kinds of high aluminum castings) and molded refractories (corundum bricks), monolithic and pre-case forms used in cast iron and steel.
Ceramics
Weight composition analysis%
Index
Al2O3
≥ %
Fe2O3
≤ %
Na2O3
≤ %
SiO2
≤ %
Ture density
≥ g/cm3
L.O.I
≤ %
Primary crystal size
μm
Typical value
99.7~99.8
0.02~0.03
0.03~0.2
0.03~0.05
3.94~3.97
0.1
1~5
Sizes available:
325mesh, 500mesh, 800mesh, 5μm, 3μm, 2μm, 1μm
Other sizes are also available upon request.
It can be used on all types of wear resistant ceramics, enamels, high temperature resistant porcelain, electronic substrate, etc.
Polished
Weight composition analysis%
Index
Al2O3
≥ %
Fe2O3
≤ %
Na2O3
≤ %
SiO2
≤ %
Turebr density>
≥ g/cm3
Hardness
Mohs
Primary crystal size
μm
Typical value
99.5
0.05
0.2~0.3
0.08~0.12
3.90~3.97
9
1~6
Available sizes:
325mesh, 500mesh, 800mesh, 5μm, 3μm, 2μm, 1μm.
Other sizes are also available on request.
It is widely used for crushing and polishing aluminum, steel, stainless steel, stone, glass, wall and floor bricks. It has garnered high praise from customers since it first appeared on the market. The superior polishing performance for stainless steel, copper and glass is obvious.