|
General Characteristics
| Chemical Formula |
Al2O3 |
| Bulk
Specific Gravity |
3.55 |
| Apparent
Porosity |
4.0% |
| Water
Absorption |
1.0% |
| Melting
Temperature |
2040°C |
| Refractive
Index |
1.76 |
| Mohs'
Hardness |
9 |
| Appearance
|
White Crystalline Granules
or Powder |
AluChem AC-99 Tabular Aluminas are high-density,
fully shrunk, coarse crystalline alpha aluminas
that have been converted to the corundum form.
Tabular Alumina is produced by sintering ball-formed
calcined alumina at a temperature just under the
2040°C fusion point of aluminum oxide. These
Tabular Alumina balls are then crushed, graded
or screened, and ground to a wide range of granular
or powdered particle size distributions. The typical
chemical and physical properties which characterize
AluChem's AC-99 Tabular Aluminas are presented
in this product data. Some of these properties
are highlighted by the following: |
• Chemical purity - 99.5% Al2O3
|
|
• Chemical inertness - resistant to most alkalis
and mineral acids
|
|
• High density - true density of 3.96 with
a bulk specific gravity of 3.55 and an apparent
porosity of 4.0%
|
|
• Low water absorption - 1.0%
|
|
• Extreme hardness - 9 on the Mohs' scale
and a Knoop hardness of 2,000
|
|
• High thermal conductivity -
@ 100°C 0.069 cal/sec cm °C
|
|
• Good resistance to thermal and mechanical
shock
|
|
• High heat capacity - specific heat
@ 20°C 0.21 cal/gm/°C
|
|
• High electrical resistivity
|
|
• Excellent abrasion resistance
|
|
Typical Chemical Composition
| Properties
|
AC-99 |
| Al2O3,
% |
99.5 |
| SiO2,
% |
0.04 |
| Fe2O3,
% |
0.06 |
| Na20,
% |
0.30 |
| L.O.I. (300 - 1200°C),
% |
0.00 |
| Alpha Phase |
99+ |
Tyler Sieve Specifications
for Standard Products
|
Screened Convertor Discharge Balls
|
Size |
| |
-3/4 Inch
+ 1/2 Inch
|
| |
|
|
Crushed Sizes |
Sieve Analysis |
| |
5% Max. On |
| Minus 1/4 Inch
|
1/4 Inch |
| Minus 6 Mesh |
6 Mesh |
| Minus 8 Mesh |
8 Mesh |
| Minus 14 Mesh |
14 Mesh |
| Minus 28 Mesh |
28 Mesh |
| Graded
Sizes |
Sieve Analysis |
| |
2% Max. On |
5% Max. Through |
| 1/4 Inch to 8 Mesh
|
1/4 Inch
|
10 Mesh |
| 3 Mesh to 6 Mesh
|
3 Mesh |
8 Mesh |
| 6 Mesh to 14 Mesh
|
6 Mesh |
20 Mesh |
| 8 Mesh to 14 Mesh
|
8 Mesh |
20 Mesh |
| 14 Mesh to 28 Mesh
|
14 Mesh |
35 Mesh |
| 28 Mesh to 48 Mesh
|
28 Mesh |
65 Mesh |
|
Ground Sizes |
Sieve Analysis |
| |
5% Max. On |
| Minus 48 Mesh |
48 Mesh |
| Minus 60 Mesh |
60 Mesh |
| Minus 100 Mesh
|
100 Mesh |
| Minus 325 Mesh
|
325 Mesh |
| Minus 325 Mesh
- Low Iron |
325 Mesh |
|
