Brown Aluminum Oxide for Polishing Phone Accessories
Brown aluminum oxide, also known as brown fused alumina, is a widely used abrasive material in polishing phone accessories due to its high hardness, durability, and cost-effectiveness. It is particularly suitable for metal, glass, and ceramic components in smartphones, such as frames, buttons, camera rings, and decorative trims.
1. Key Applications in Phone Accessories Polishing
A. Metal Components
Aluminum Frames (iPhone, Samsung, etc.) – Removes CNC machining marks and burrs.
Stainless Steel Buttons & Bands – Provides a uniform satin or brushed finish.
Zinc Alloy Decorative Parts – Polishes without excessive material removal.
B. Glass & Ceramic Parts
Back Panels (e.g., iPhone, Huawei) – Used in intermediate polishing before final mirror finish.
Camera Lens Rims – Helps achieve a smooth, scratch-free surface.
C. Plastic & Composite Materials
Polycarbonate or PMMA Cases – Light polishing for gloss enhancement (requires finer grits).
2. Advantages of Brown Aluminum Oxide for Phone Polishing
| Property | Benefit for Phone Accessories |
|---|---|
| High Hardness (Mohs 9.0) | Efficiently removes defects without damaging substrates. |
| Controlled Particle Size (W40-W1) | From rough grinding (W40) to fine polishing (W1). |
| Thermal & Chemical Stability | Works well in wet/dry polishing without degradation. |
| Cost-Effective | Cheaper than diamond or SiC, ideal for mass production. |
3. Recommended Grit Sizes for Different Stages
| Polishing Stage | Grit Size (FEPA Standard) | Surface Finish (Ra) |
|---|---|---|
| Rough Grinding | W40-W20 (40-20µm) | Ra 0.8-1.2µm |
| Intermediate Polishing | W14-W7 (14-7µm) | Ra 0.4-0.8µm |
| Fine Polishing | W5-W1 (5-1µm) | Ra 0.1-0.4µm |