Can tabular alumina powder be used for polishing?
Yes, tabular alumina powder can be used for polishing, but it is not the best choice for mirror-finish polishing.
It is suitable for coarse polishing, semi-fine polishing, and deburring, but it cannot achieve a mirror-like surface.
1. Can it be used for polishing? (Yes)
Tabular alumina has high hardness (Mohs 9) and sharp edges, so it can effectively remove surface layers, burrs, and oxides.
2. Limitations (Not for mirror polish)
- Particle shape: Tabular alumina crystals are plate-like with sharp edges, which easily cause scratches.
- Surface finish: It can only reach a matte or semi-mirror surface (Ra ≈ 0.4–0.8 μm), not a mirror finish (Ra ≤ 0.05 μm).
3. Best Applications for Tabular Alumina Polishing
- Deburring and removing surface defects of metal parts
- Coarse/semi-fine polishing of castings
- Matte/acid-washed finish treatment
- Polishing of refractory/ceramic components
4. When to Use Other Powders Instead
For mirror polishing (precision parts, molds, optical glass, etc.), use:
- White fused alumina powder (with uniform particle size)
- Cerium oxide powder
- Diamond powder
