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White fused alumina for abrasives, offering exceptional hardness and durability for grinding, polishing, and surface finishing.

Alúmina fundida blanca para abrasivos

White fused alumina for abrasives is a high-purity, durable material ideal for grinding, polishing, and finishing, offering superior hardness and consistent performance.

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White fused alumina (WFA) is a premium-grade synthetic material made by melting and purifying high-quality aluminum oxide in an electric arc furnace. Renowned for its exceptional hardness, purity, and sharp-edged particles, WFA is an essential material in the abrasives industry. Its excellent wear resistance, thermal stability, and chemical inertness make it the ideal choice for producing bonded and coated abrasives, grinding wheels, and polishing compounds.

With consistent particle size distribution and high friability, white fused alumina delivers superior cutting efficiency and a refined surface finish. Its versatility allows it to perform effectively on a wide range of materials, including metals, ceramics, glass, and composites, ensuring high performance in diverse abrasive applications.

Product Features

 1. High Hardness: With a Mohs hardness of 9.0, WFA ensures aggressive material removal and durability in abrasive tools.

 2. High Purity: Contains over 99% aluminum oxide, ensuring minimal impurities and excellent performance.

 3. Thermal Stability: Withstands high temperatures, making it suitable for high-speed grinding and polishing.

 4. Sharp Edges: The angular and sharp-edged particles enhance cutting efficiency and precision.

 5. Recyclability: White fused alumina can be reused multiple times in abrasive applications, improving cost-effectiveness.

Production Process:

 1. Raw Material Selection: High-quality alumina is carefully selected to ensure minimal impurities.

 2. Fusing Process: The alumina is melted in an electric arc furnace at temperatures exceeding 2000°C.

 3. Cooling and Crushing: The molten material is cooled and then crushed into particles of varying sizes.

 4. Purification: Magnetic separation and sieving are performed to remove impurities and achieve uniform particle sizes.

 5. Screening and Grading: The final product is classified into different grit sizes to meet specific abrasive needs.

For abrasives application:

1. Bonded Abrasives: Used in grinding wheels and segments for precision machining of metals, ceramics, and other materials.

 2. Coated Abrasives: A key material in sandpaper and abrasive belts for polishing and finishing surfaces.

 3. Blasting Media: Ideal for surface cleaning, texturing, and preparation in industries like aerospace and automotive.

 4. Polishing Compounds: Ensures fine surface finishing and high precision in optics, electronics, and jewelry.

Especificación química

Parameter Specification Range Description
Al₂O₃ (Aluminum Oxide) ≥ 99.5% Main component ensuring hardness and durability.
SiO₂ (Silicon Dioxide) ≤ 0.2% Controlled impurity to enhance material purity.
Fe₂O₃ (Iron Oxide) ≤ 0.05% Low iron content suitable for sensitive applications.
Na₂O (Sodium Oxide) ≤ 0.4% Low sodium content ensures better high-temperature performance.
Crystal Structure Trigonal High hardness with sharp-edged particles.
Mohs Hardness 9 Close to diamond, suitable for high-hardness grinding.
Color White Pure white color, free from impurities.
Bulk Density 1.75 – 1.95 g/cm³ Affects material efficiency in abrasive applications.
True Density ≥ 3.95 g/cm³ Reflects the material’s purity and quality.
Particle Size Range F8 – F220 (FEPA Standard) Available from coarse grit to fine powder for various applications.
Melting Point 2250°C High melting point ensures stability in high-temperature environments.
Thermal Expansion Coefficient 7-9 × 10⁻⁶ /°C (20-1000°C) Minimal size changes under high temperature, suitable for precision processing.

Certificate of  Analysis

Certificate of  Analysis Report

Report No. WFA-2024-001 Date: December 14, 2024
Product Name White Fused Alumina (WFA) Application: Abrasives
Supplier Luoyang Best Abrasives Co., Ltd Inspector: John

 

Chemical Composition

Component Standard (%) Tested Value (%)
Al₂O₃ (Alumina) ≥ 99.5 99.60
SiO₂ (Silica) ≤ 0.20 0.12
Fe₂O₃ (Iron Oxide) ≤ 0.10 0.06
Na₂O (Sodium Oxide) ≤ 0.40 0.35

 

Physical Properties

Property Standard Tested Value
Bulk Density (g/cm³) 3.50-3.95 3.80
Hardness (Mohs) 9.0 9.0
Grain Shape Angular/Sharp Angular/Sharp
Melting Point (°C) ≥ 2050 2050

 

Particle Size Distribution (Mesh: FEPA Standard)

Mesh Size Standard (%) Tested Value (%)
+120 ≤ 5.0 4.5
-120 +150 30-40 35.2
-150 +180 25-35 30.1
-180 +220 20-30 22.8
-220 ≤ 5.0 3.7

 

Application Recommendation

White Fused Alumina is suitable for abrasive applications including:

  1. Grinding wheels.
    2. Coated abrasives.
    3. Blasting media.

Conclusion

The tested sample of White Fused Alumina meets the international standards for abrasive applications.

Approved By: Signature:
Quality Manager John

 

 

 

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