Product Description
White Fused Alumina is produced by fusing high-purity industrial alumina powder in an electric arc furnace at temperatures above 2000°C, followed by cooling, crushing, shaping, iron removal by magnetic separation, and screening into various particle sizes.
It is characterized by high hardness, high density, purity, and chemical stability. Compared with Brown Fused Alumina, White Fused Alumina has slightly higher hardness, lower toughness, higher purity, excellent self-sharpening ability, strong grinding performance, low heat generation, high grinding efficiency, excellent acid and alkali resistance, and good thermal stability.
White Fused Alumina is widely used in ceramic and resin bonded abrasives, polishing, sandblasting, precision casting, and refractory materials. Its designation "WA" conforms to the international standard for white alumina abrasives. It is suitable for grinding high-carbon steel, high-speed steel, and other hard alloys, as well as for precision polishing, blasting, thermal spraying, catalyst carriers, and special ceramics.
Main Applications
- Various sandblasting and polishing (lapping) operations
- Matte finishing for glass and acrylic artwork
- Sandblasting for television screen and panel manufacturing
- Cutting of silicon wafers and precision electronic materials
- Cleaning and sandblasting of dental molds and instruments
- Precision casting molds and refractory aggregates
Technical Specifications
Chemical Composition (Typical Values)
| Application | Size Range | Al₂O₃ (%) | Na₂O (%) | Fe₂O₃ (%) | SiO₂ (%) |
|---|---|---|---|---|---|
| Abrasives / Grinding Tools | F6#–F80# | ≥99.3 | ≤0.40 | ≤0.05 | ≤0.05 |
| Abrasives / Grinding Tools | F90#–F150# | ≥99.2 | ≤0.40 | ≤0.05 | ≤0.05 |
| Fine Abrasives | F180#–F240# | ≥99.0 | ≤0.40 | ≤0.10 | ≤0.10 |
| Micro Powder | W3.5#–W63# | ≥99.0 | ≤0.50 | ≤0.10 | ≤0.10 |
| Refractory Materials | Fine Powder (180F / 200F / 325F) | ≥99.0 | ≤0.50 | ≤0.10 | ≤0.10 |
| Refractory Materials | Fractional Sand (0–1 / 1–3 / 3–5 / 5–8 mm) | ≥99.2 | ≤0.45 | ≤0.10 | ≤0.05 |
Note: "F" represents fused abrasive grain grades for bonded/sandblasting applications. "W" represents micro powder grades. Fine powders are ball-milled using alumina-lined mills; granular sizes are produced using Barmac crushers.
Physical Properties
Crystal Form
Hexagonal
True Density
3.90 g/cm³
Bulk Density
1.53–1.99 g/cm³
Mohs Hardness
9.0
Color
White
Melting Point
2250°C
Max Service Temperature
1900°C
Coefficient of Linear Expansion
(7–9)×10⁻⁶ /K (0–1600°C)
Product Advantages
- Does not affect the color of processed parts
- Suitable for processes strictly prohibiting iron contamination
- Micro-powder grade is ideal for wet blasting and lapping operations
- High processing speed and superior surface quality
- Very low Fe₂O₃ content — suitable for non-ferrous blasting
- Acid-washed to remove impurities, ensuring purity and consistency
📦 Packaging
Standard: 25 kg double-layer bags (inner plastic, outer woven)
Optional: 1,000 kg jumbo bags or customized printed packaging per customer request
Grain sizes are produced according to international and national standards (F6–F220), or customized per user requirements. Its chemical composition varies slightly depending on particle size. A key feature is fine crystal structure and high impact resistance.