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| Natural Abrasive Type: | Natural Corundum |
| Artificial Abrasive Type: | Corundum Abrasives |
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| Typical Anaysis | Characteristics | |||
| Al2O3 | 99.5% | Crystal Form | Rhombohedral Class | |
| TiO2 | 0.0995% | Chemical Nature | Amphoteric | |
| SiO2 (not free) | 0.05 | Specific Gravity | 3.95 grm/cc | |
| Fe2O3 | 0.08 | Bulk Density | 116 lbs/ ft3 | |
| MgO | 0.02 | Hardness | KNOPPS = 2000, MOHS = 9 | |
| Alkali (Soda & Potash) | 0.30 | Melting Point | 2,000°C | |
| Reaction with Acids | Subject to mild attack by aqua regia and/or Hydrofluic | |||
| White Aluminum Oxide Grit Specifications | |
| Mesh | Average Particle Size the smaller the mesh number, the coarser the grit |
| 8 Mesh | 45% 8 mesh (2.3 mm) or larger |
| 10 Mesh | 45% 10 mesh (2.0 mm) or larger |
| 12 Mesh | 45% 12 mesh (1.7 mm) or larger |
| 14 Mesh | 45% 14 mesh (1.4 mm) or larger |
| 16 Mesh | 45% 16 mesh (1.2 mm) or larger |
| 20 Mesh | 70% 20 mesh (0.85 mm) or larger |
| 22 Mesh | 45% 20 mesh (0.85 mm) or larger |
| 24 Mesh | 45% 25 mesh (0.7 mm) or larger |
| 30 Mesh | 45% 30 mesh (0.56 mm) or larger |
| 36 Mesh | 45% 35 mesh (0.48 mm) or larger |
| 40 Mesh | 45% 40 mesh (0.42 mm) or larger |
| 46 Mesh | 40% 45 mesh (0.35 mm) or larger |
| 54 Mesh | 40% 50 mesh (0.33 mm) or larger |
| 60 Mesh | 40% 60 mesh (0.25 mm) or larger |
| 70 Mesh | 45% 70 mesh (0.21 mm) or larger |
| 80 Mesh | 40% 80 mesh (0.17 mm) or larger |
| 90 Mesh | 40% 100 mesh (0.15 mm) or larger |
| 100 Mesh | 40% 120 mesh (0.12 mm) or larger |
| 120 Mesh | 40% 140 mesh (0.10 mm) or larger |
| 150 Mesh | 40% 200 mesh (0.08 mm) or larger |
| 180 Mesh | 40% 230 mesh (0.06 mm) or larger |
| 220 Mesh | 40% 270 mesh (0.046 mm) or larger |
| 240 Mesh | 38% 325 mesh (0.037 mm) or larger |
| 280 Mesh | Median: 33.0 - 36.0 micron |
| 320 Mesh | 60% 325 mesh (0.037 mm) or finer |
| 360 Mesh | Median: 20.1-23.1 micron |
| 400 Mesh | Median: 15.5-17.5 micron |
| 500 Mesh | Median: 11.3-13.3 micron |
| 600 Mesh | Median: 8.0-10.0 micron |
| 800 Mesh | Median: 5.3-7.3 micron |
| 1000 Mesh | Median: 3.7-5.3 micron |
| 1200 Mesh | Median: 2.6-3.6 micron |
3. TYPICAL PROPERTIES
High Hardness
High Compression Strength
Abrasion/ Wear-Resistance
Abrasives
Chemical Inertness
High Degree of Refractoriness
Superior Electrical Insulating Properties
Dielectric Properties
High Melting Point
Combining different highly pure calcined alumina in electric arc furnaces produces White Fused Alumina (WFA). WFA is a hard, friable raw material with high purity, chemical stability, a high melting point, and a large crystal size. It's suited for high-purity, chemical-stability, or refractoriness refractory applications.
• Materials for polishing cloths and abrasive tape
• High-classed polishing grinding wheels and precision grinding wheels (bearing steel, etc.)
• Metal, glass, crystal, semiconductor crystal, and other materials lapping materials
• Electrical insulating materials, refractory materials of high quality, and other products
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