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Tabular Alumina is a high-density, fully shrunk, coarse crystalline alpha-alumina that has been converted to the corundum form. It is a completely crystallized α-alumina sintered at slightly below the melting point of imported alumina after batching, grinding, and molding.
Tabular Alumina is produced by sintering ball-formed alumina at a temperature under the 2040°C fusion point of aluminum oxide. The crystals are arranged in a tabular staggered way, which increases the mechanical strength of the particles.
Tabular alumina has characteristic large, well-developed hexagonal tablet-shaped α-alumina crystals of up to 200μm length.
Specific gravity | 3.96 g/cm3 |
Bulk density | 3.45-3.5g/cm3 |
Apparent porosity | 2-5% |
water absorption rate | 0.7-1.5% |
Mohs’ Hardness | 9.0 |
Knoop hardness | 2000kg/cm3 |
Thermal conductivity | (100℃)0.069 cal/sec cm℃ |
Heat capacity | (20℃)0.21cal/gm/(100℃) |
Melting temperature | 2050℃ |
Max. service temperature | min 1800℃ |
Refractive Index | 1.76 |
Appearance | White granules or powder |
Index | AL2O3 | SiO2 | Fe2O3 | Na2O |
Guarantee Value | ≥ 99.2 | MAX. 0.18 | ≤ 0.1 | ≤ 0.4 |
Typical Value | 99.45 | 0.05 | 0.02 | 0.32 |
Index | Bulk density(g/cm3) | Porosity(%) | Water absorption rate(%) |
Guarantee Value | ≥ 3.5 | ≤ 5.0 | ≤ 1.5 |
Typical Value | 3.56 | 2.35 | 0.72 |
Size: mm | Distribution | Typical Values % | MAX/MIN % |
5-10mm | 5-10mm | 92 | 75 |
7-10mm | 58 | 40 | |
5-7mm | 35 | 20 | |
3-6mm | 3-6mm | 98 | 90 |
4-6mm | 55 | 40 | |
3-4mm | 44 | 20 | |
1-3mm | 1-3mm | 99 | 90 |
2-3mm | 52 | 30 | |
1-2mm | 47 | 30 | |
1-2mm | +2.36mm | 8 | 10 |
-1mm | 5 | 10 | |
0.5-1mm | 0.5-1.18mm | 95 | 90 |
0.7-1.18mm | 45 | 35 | |
0.5-0.7mm | 50 | 20 | |
0.2-0.6mm | +0.6mm | 5 | 10 |
-0.2mm | 4 | 10 | |
0-0.5mm | 0-0.5mm | 95 | 90 |
0.15-0.5mm | 49 | 38 | |
-200# | +0.088mm | 0.3 | 3 |
-0.044mm | 96 | 90 | |
-325# | -0.044mm | 97 | 85 |
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