Alumina combustion boat is a small, open-top ceramic tray made from dense Al₂O₃, used to hold samples during high-temperature oxidation, ashing, or burn-off inside a combustion tube or furnace. Labs and process R&D teams rely on it for carbon/sulfur (C/S) elemental analysis, ash determination.
Alumina Combustion Boat Benefits
- Dimensional consistency: controlled length/width/depth and wall thickness help boats slide smoothly in combustion tubes and fixtures, lowering jam or tilt events during push-rod movement.
- Low background: high-purity alumina resists interaction with carbon/sulfur matrices and fluxes, supporting stable blanks across batches.
- Edge & lip options: rounded edge or gentle lip improves pour-out and reduces chipping at contact points.
- Thermal-shock handling: compatible with routine heat-up/cool-down cycles used in QA/QC labs.
- Simplified workflow: without pre-formed holes, the boats provide a continuous flat cavity that maximizes sample load and reduces contamination risks from sharp hole edges.
- Enhanced strength: the solid base improves mechanical integrity during multiple heating cycles, lowering breakage rates compared with perforated boats.
- Ease of cleaning & reuse: smooth internal surface and uninterrupted base allow faster residue removal and longer service life in repeated ash or oxidation runs.
Combustion Boat Alumina 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 Combustion Boat Specifications
Type 1- Round alumina crucible boat
| Item NO. | Length (mm) | Width (mm) | Height (mm) | Remark |
| TE-AS-086-1 | 150 | 40 | 20 | / |
| TE-AS-087 | 100 | 65 | 30 | / |
| TE-AS-089 | 100 | 40 | 25 | / |
| TE-AS-093 | 100 | 20 | 15 | / |
| TE-AS-093-1 | 100 | 20 | 20 | / |
| TE-AS-093-4 | 100 | 30 | 20 | / |
| TE-AS-093-5 | 100 | 40 | 20 | / |
| TE-AS-094 | 60 | 54 | 24 | / |
| TE-AS-095 | 65 | 25 | 16 | / |
| TE-AS-096 | 55 | 35 | 22 | / |
| TE-AS-097 | 40 | 35 | 25 | / |
| TE-AS-098 | 40 | 25 | 17 | / |
| TE-AS-099 | 38 | 34 | 18 | / |
| TE-AS-099-1 | 50 | 40 | 20 | / |
| TE-AS-099-12 | 60 | 30 | 15 | with cover |
| TE-AS-099-13 | 160 | 75 | 40 | / |
| TE-AS-099-14 | 103 | 55 | 30 | / |
| TE-AS-099-2 | 80 | 40 | 17 | / |
| TE-AS-099-3 | 245 | 40 | 20 | / |
| TE-AS-099-4 | 290 | 40 | 22 | / |
| TE-AS-099-8 | 100 | 50 | 30 | / |
| TE-AS-099-9 | 250 | 40 | 18 | / |
| TE-AS-119 | 100 | 40 | 25 | with cover |
| TE-AS-120 | 100 | 40 | 20 | with cover |
| TE-AS-123 | 100 | 20 | 15 | with cover |
| TE-AS-124 | 60 | 54 | 24 | with cover |
| TE-AS-124-2 | 100 | 20 | 20 | with cover |
| TE-AS-124-3 | 100 | 30 | 20 | with cover |
| TE-AS-124-4 | 100 | 50 | 30 | with cover |
Type 2-Alumina combustion boat
| Item NO. | Length(mm) | Width(mm) | Height(mm) | Purity |
| TE-AS-082-3 | 77 | 13 | 8 | 99% |
| TE-AS-080 | 88 | 15 | 9 | 99% |
| TE-AS-079-6 | 97 | 17 | 12 | 99% |
| TE-AS-079-3 | 115 | 30 | 20 | 99% |
| TE-AS-079-2 | 100 | 18 | 12 | 99% |
| TE-AS-079-1 | 85 | 15 | 9 | 99% |
| TE-AS-079 | 43 | 11 | 11 | 99% |
Type 3-Long alumina combustion boat
| Item NO. | Length(mm) | Width(mm) | Height(mm) | Purity |
| TE-AS-085-1 | 27 | 7 | 6 | 99% |
| TE-AS-078-1 | 40 | 9 | 9 | 99% |
Type 4-Alumina ceramic boat crucible
| Item NO. | Length(mm) | Width(mm) | Height(mm) | Purity |
| TE-AS-078-2 | 60 | 11 | 8 | 99% |
*Note: The table above shows only some standard specifications. For more specifications, please refer to the complete product catalogue or contact us for customization.
Alumina Combustion Boat Packaging
- Unit protection: each boat is set in individual cells with foam lattice to avoid edge chipping.
- Carton: layered trays; outer carton labelled by drawing code and quantity.
