Alumina beads are small, precision-formed ceramic spheres made primarily from aluminum oxide (Al₂O₃). They are engineered for industrial duties where mechanical strength, thermal stability, and chemical resistance are essential—most commonly as adsorbents/dryers, catalyst carriers/support media, and grinding/polishing media.
Alumina Ceramic Beads Advantages
- Optimized Sphericity & Uniform Size – Precisely controlled bead geometry ensures consistent packing density and predictable pressure drop in adsorption and catalytic reactors.
- Low Attrition Rate – Engineered manufacturing minimizes dust generation, which reduces contamination in reactors and extends catalyst bed operating cycles.
- Versatile Form Options – Available in multi-bore, inert, or activated designs, allowing engineers to match bead structures with specific gas/liquid flow requirements.
- Enhanced Regeneration Performance – Activated alumina beads maintain adsorption capacity over multiple thermal regeneration cycles, reducing replacement frequency and operating costs.
- Customizable Distribution & Bed Support – Beads can be supplied in graded size layers (small-to-large stacking) to improve flow uniformity and protect fragile catalysts from pressure surges.
Al2O3 Ceramic Beads Properties
| Property | Unit | 99.7% Al₂O₃ | 99.5% Al₂O₃ | 99% Al₂O₃ | 96% Al₂O₃ |
| Color | Ivory White | Ivory White | Ivory White | Ivory White | |
| Density | g/cm³ | 3.94 | 3.9 | 3.83 | 3.6-3.75 |
| Water Absorption | % | 0 | 0 | 0 | 0 |
| Hardness | Mohs Hardness | 9.1 | 9 | 9 | 8.8 |
| Flexural Strength (20°C) | Mpa | 330 | 320 | 300 | 260 |
| Compressive Strength (20°C) | Mpa | 2300 | 2300 | 2210 | 1910 |
| Maximum Operating Temperature | °C | 1730 | 1700 | 1680 | 1450 |
| Thermal Expansion Coefficient(25°C to 800°C) | 10⁻⁶/°C | 7.6 | 7.6 | 7.6 | 7.6 |
| Thermal Conductivity (25°C) | W/(m·K) | 29 | 27 | 24 | 22 |
| Dielectric Strength (5mm thickness) | AC-kv/mm | 22 | 21 | 19 | 15 |
| Dielectric Loss at 25°C@1MHz | --- | < 0.0001 | < 0.0001 | 0.0003 | 0.0004 |
| Dielectric Constant at 25°C@1MHz | --- | 9.8 | 9.7 | 9.5 | 9.2 |
| Volume Resistivity (20°C) | Ω·cm³ | >10¹⁴ | >10¹⁴ | >10¹⁴ | >10¹⁴ |
| Volume Resistivity (300°C) | Ω·cm³ | 2*10¹² | 2*10¹² | 4*10¹¹ | 2*10¹¹ |
Alumina Beads Specifications

Type 1: Activated alumina beads

*More sizes and specifications about Activated alumina beads
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Type 2: Inert alumina (support) beads

*More sizes and specifications about Inert alumina (support) beads
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Type 3: wear resistant alumina grinding beads

*More sizes and specifications about wear resistant alumina grinding beads
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Type 4: alumina ceramic multi bores beads

*More sizes and specifications about alumina ceramic multi bores beads
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Type 5: insulator alumina beads

*More sizes and specifications about insulator alumina beads
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Alumina Ceramic Bead Packaging
- High alumina beads are packaged in 25 kg heavy-duty plastic bags, which are then placed inside 1-ton jumbo bags with inner waterproof liners. The jumbo bags are palletized and shrink-wrapped for secure, moisture-free international transport.







