Alumina
Calcined Alumina
Calcined alumina is produced by calcining alumina at controlled temperatures to convert it into the stable alpha phase (5–100 %). With high purity, high thermal conductivity and refractoriness, dimensional stability and excellent abrasion resistance, it is supplied in a range of grain sizes and soda contents.
Typical Analysis
CAL (low-soda) and CA series
| Property | 30CAL | 40CAL | 50CAL | 30CA | 40CA | 50CA |
|---|---|---|---|---|---|---|
| Al₂O₃ (%) | 99.5 | 99.5 | 99.5 | 99.3 | 99.3 | 99.3 |
| Na₂O (%) | 0.06 | 0.06 | 0.06 | 0.29 | 0.27 | 0.27 |
| CaO (%) | 0.02 | 0.02 | 0.02 | 0.02 | 0.02 | 0.02 |
| SiO₂ (%) | 0.06 | 0.06 | 0.06 | 0.08 | 0.08 | 0.08 |
| Fe₂O₃ (%) | 0.02 | 0.02 | 0.02 | 0.02 | 0.02 | 0.02 |
| Passing 45 µm (%) | 99.9 | 99.8 | 99.8 | 99.9 | 99.8 | 99.8 |
| D₅₀ (µm) | 3.4 | 4.2 | 5.6 | 3.4 | 4.2 | 5.6 |
| BET (m²/g) | 1.0 | 0.9 | 0.8 | 1.0 | 0.9 | 0.8 |
Grade AP-20X
| Property | Value |
|---|---|
| Al₂O₃ (%) | 99.4 |
| Na₂O (%) | 0.14 |
| SiO₂ (%) | 0.0256 |
| Fe₂O₃ (%) | 0.0197 |
| D₅₀ (µm) | 3.8 |
Key Properties
| Purity | ≥ 99% Al₂O₃ |
|---|---|
| BET surface area | 0.8 - 1.0 m²/g |
| Forms | Milled and unmilled |
