An alumina membrane tube is a multi-channel ceramic filtration element used in crossflow systems for microfiltration/ultrafiltration-style separation, where stable operation and repeatable cleaning are required.
Alumina Membrane Tube Advantages
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Channel-to-channel consistency to reduce uneven loading and early fouling in crossflow operation.
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End-face and sealing-zone controllability to support stable potting or gasket sealing designs.
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Geometry options for pressure-drop control, enabling higher crossflow velocity without oversizing pumps.
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Compatibility with frequent CIP cycles where cleaning strength and thermal exposure are part of normal operation.
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Stable integration into skid-scale modules to support repeatable scale-up from pilot to production.
Alumina Membrane Tube Properties
| Property | Unit | 99.5% Al₂O₃ | 99.6% Al₂O₃ | 99.7% Al₂O₃ | 99.8% Al₂O₃ | 99.9% Al₂O₃ | 99.99% Al₂O₃ |
| Alumina content | % | 99.5 | 99.6 | 99.7 | 99.8 | 99.9 | 99.99 |
| Density | g/cm³ | 3.89 | 3.91 | 3.92 | 3.93 | 3.94 | 3.98 |
| Open porosity | % | 0 | – | – | – | – | – |
| Color | – | Ivory | Ivory | Ivory | Ivory | Ivory | Ivory |
| Water absorption | % | – | 0 | 0 | 0 | 0 | 0 |
| Young’s modulus (Elastic modulus) | GPa | 375 | 356 | 357 | 358 | 359 | 362 |
| Shear modulus | GPa | 152 | – | – | – | – | – |
| Bulk modulus | GPa | 228 | – | – | – | – | – |
| Poisson’s ratio | – | 0.22 | – | – | – | – | – |
| Compressive strength | MPa | 2600 | 2552 | 2554 | 2556 | 2558 | 2570 |
| Flexural strength | MPa | 379 | 312 | 313 | 314 | 315 | 320 |
| Fracture toughness | MPa·m¹ᐟ² | 4 | – | – | – | – | – |
| Hardness | GPa | 14.1 (≈1440 kg/mm²) | 23 | 24 | 25 | 26 | 30 |
| Thermal conductivity | W/m·K | 35 | 32–37 | 33–38 | 34–39 | 35–40 | 36–42 |
| Thermal shock resistance ΔT | °C | – | 222 | 223 | 224 | 225 | 228 |
| Maximum use temperature (no load) | °C | ≤1750 | 1755 | 1760 | 1765 | 1770 | 1800 |
| Coefficient of thermal expansion | 10⁻⁶/°C | 8.4 | – | – | – | – | – |
| Specific heat | J/kg·K | 880 | – | – | – | – | – |
| Volume resistivity | Ω·cm | >1×10¹⁴ | >1×10¹⁴ | >1×10¹⁴ | >1×10¹⁴ | >1×10¹⁴ | >1×10¹⁴ |
| Dielectric constant (relative permittivity) | – | 9.8 | 9.83 | 9.84 | 9.85 | 9.86 | 9.92 |
| Dielectric strength | kV/mm | 16.9 | 23.2 | 23.4 | 23.6 | 23.8 | 24 |
| Dissipation factor (loss factor @ 1 kHz) | – | 0.0002 | – | – | – | – | – |
Alumina Membrane Tube Specifications
| Parameter | Specification |
|---|---|
| Material of Support | α-Al₂O₃ |
| Material of Membrane | ZrO₂ / TiO₂ / SiC / α-Al₂O₃ |
| Pore Size (nm) | 10 – 1200 |
| Length (mm) | 200 – 1200 |
| Outer Diameter (OD, mm) | 14.0 – 53.0 |
| Inner Diameter (ID, mm) | 3.3 – 8.0 |
| Number of Channels | 1 / 3 / 7 |
| Membrane Area per Element (m²) | 0.025 – 0.075 |
| Max. Operating Pressure (bar) | 10 |
| pH Range | 0 – 14 |
| Flux (m³/m²·h·bar) | 715 – 2500 |
| No. | Number of Channels | Outer Diameter (mm) | Sealing End Outer Diameter (mm) | Single Channel Diameter (mm) | Flow Cross-Sectional Area (cm²) | Membrane Area per 1 m Length (m²) | Membrane Area per 1.2 m Length (m²) | Picture |
| AT-FT-9001 | 7 | 25.5 | 25 | 6 | 1.98 | 0.14 | 0.158 |
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| AT-FT-9002 | 19 | 25.5 | 25 | 3.5 | 1.62 | 0.2 | 0.246 |
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| AT-FT-9003 | 19 | 30.5 | 30 | 3.8 | 2.55 | 0.227 | 0.272 |
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| AT-FT-9004 | 19 | 41 | 40 | 6 | 5.37 | 0.36 | 0.43 |
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| AT-FT-9005 | 37 | 41 | 40 | 3.8 | 4.19 | 0.442 | 0.53 |
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Alumina Membrane Tube Packing
- Each alumina membrane tube is individually sleeved to prevent edge chipping on ends.
- Tubes are fixed in foam channels with end protection to limit impact during transit.
