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Precision Graded Calcined Alumina
A high purity water classified calcined alumina. Precision
Graded! These powders made from single crystal alumina platelets
may be used in applications such as glass and metal polishing,
thermal spray powders and as a filler for various materials.
The platelets lay flat during lapping to provide high cut
rates and lower surface roughness. These powders can be treated
for full or partial suspension in a lapping and or polishing
vehicle.
| Typical Chemistry |
| Al2O2 |
98.7 % min. |
| SiO2 |
0.06 % max. |
| Na2O |
1.0 % max. |
| CaO |
0.07 % max. |
| Fe2O3 |
0.03 % max. |
| MgO |
0.05 % max. |
|
 |
| Characteristics |
| Appearance |
White Powder |
| Particle Shape |
Platelet |
| LOI |
0.1% |
| pH |
9 |
| Melting Point |
2020 C |
Hardness
( Knoop)
|
1800-2200 |
| Hardness (Mohs) |
9 |
| Bulk Density |
1.1-1.3 g/cc |
| Crystal Density |
3.95 g/cc |
| Phase |
Alpha 90% |
|
| |
Particle Size
|
d 3 um |
d 50 um |
d 94 um |
| 1.0 |
4.0 |
0.7 – 1.4 |
N/A |
| 2.0 |
6.0 |
1.7 – 2.7 |
N/A |
| 3.0 |
10.0 |
2.5 – 3.5 |
1.0 |
| 5.0 |
12.0 |
3.5 – 4.5 |
1.5 |
| 9.0 |
15.0 |
5.5 – 6.5 |
2.5 |
| 12.0 |
18.0 |
7.5 – 8.5 |
4.0 |
| 15.0 |
20.0 |
10.5 – 11.5 |
6.0 |
| 18.0 |
22.0 |
11.5 – 12.75 |
7.0 |
| 20.0 |
24.0 |
12.75 – 14.00 |
8.0 |
| 22.0 |
30.0 |
14.00 – 16.00 |
8.5 |
| 25.0 |
34.0 |
16.00 – 18.00 |
9.0 |
| 30.0 |
38.0 |
20.00 – 23.00 |
12.0 |
|
Sizing Determined by Coulter Multisizer
Certificate of analysis provided with each shipment
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