Square Rectangular Corundum Alumina Boat Tray Melting Crucible
Our rectangular thin alumina boat crucible is precision-engineered from high-purity alumina (Al₂O₃) ceramic, specifically designed for horizontal tube furnaces and combustion analysis systems. The elongated, low-profile rectangular shape allows smooth insertion into cylindrical heating zones while maintaining unobstructed gas flow across the sample surface. With purity options from 99% to 99.7%, these boats deliver exceptional high-temperature stability, chemical inertness, and thermal shock resistance — making them the reliable choice for laboratories and industrial processes requiring consistent, contamination-free results.
Key Features & Benefits
Ultra-High Temperature Resistance
Withstands continuous operation up to 1600°C (99%) and 1800°C (99.7%), with short-term exposure to 1850°C. Stable in oxidizing, reducing, and vacuum atmospheres.
High Purity & Chemical Inertness
Al₂O₃ content up to 99.7%, Fe₂O₃ < 0.01%. Does not react with most acids, alkalis, and molten salts. Eliminates sample contamination for accurate analytical results.
Tube-Furnace Optimized Design
Elongated rectangular shape with low wall height fits standard tube furnace diameters perfectly. Open-top design promotes uniform gas flow and even heating, eliminating hot spots.
Excellent Thermal Shock Resistance
Low thermal expansion coefficient (7.9~8.2 × 10⁻⁶/°C) and high thermal conductivity enable rapid heating and cooling cycles without cracking, reducing cycle time and boosting throughput.
Zero Porosity & Impervious
Fully dense structure (density > 3.8 g/cm³) with zero open porosity. Prevents liquid and gas penetration, ensures easy cleaning and residue-free sample transfer.
Customizable Dimensions
Wide range of standard sizes from 50×20×10mm to 300×40×30mm. Custom lengths, widths, wall thicknesses, with/without lids, and perforated versions available to match specific furnace and process requirements.
Application
Specifications
| Property |
Unit |
99% Al₂O₃ |
99.5% Al₂O₃ |
99.7% Al₂O₃ |
| Al₂O₃ Content |
% |
≥ 99 |
≥ 99.5 |
≥ 99.7 |
| Fe₂O₃ Content |
% |
≤ 0.05 |
≤ 0.02 |
≤ 0.01 |
| Bulk Density |
g/cm³ |
≥ 3.80 |
≥ 3.88 |
≥ 3.90 |
| Open Porosity |
% |
0 |
0 |
0 |
| Max Continuous Temp |
°C |
1600 |
1700 |
1800 |
| Max Short-Term Temp |
°C |
1700 |
1780 |
1850 |
| Thermal Expansion Coefficient |
×10⁻⁶/°C |
7.9 |
8.0 |
8.2 |
| Thermal Conductivity |
W/(m·K) |
25 |
27 |
30 |
| Vickers Hardness |
HV |
1600 |
1650 |
1700 |
| Color |
— |
White |
Ivory White |
Ivory White |
Alumina Ceramic Crucible Basic size:
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Type
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5ml
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5ml
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8ml
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10ml
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15ml
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20ml
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25ml
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30ml
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Type
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Upper Diameter(mm)
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Height(mm)
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Bottom Diameter(mm)
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40ml
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48
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42
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21
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50ml
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53
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47
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31
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100ml
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64
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60
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35
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150ml
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74
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63
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39
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200ml
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78
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70
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42
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300ml
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92
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83
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47
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500ml
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92
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122
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75
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950ml
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102
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160
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60
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1000ml
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126
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145
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73
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2000ml
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145
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155
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95
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Feature Advantage
Physical Character of the alumina ceramic crucible
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Linear expansion coefficient
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Dielectric constant (1MHZ)
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Advantages of alumina crucible compared with other crucible:
1. Excellent high temperature performance: alumina crucible can be used at high temperatures,
has a high melting point and chemical stability, can withstand temperature conditions.
2. Good corrosion resistance: alumina crucible has good corrosion resistance to most acids,
alkali, salt and other chemical substances, which can ensure the accuracy and safety of the experiment.
3. High strength and good mechanical properties: alumina crucible has high mechanical strength and hardness,
can withstand greater pressure and vibration, not easy to break or deformation.
4. Good thermal conductivity: the alumina crucible has high thermal conductivity and can transfer heat quickly,
which is conducive to the experiment.
5. Long service life: alumina crucible has high hardness, is not easy to wear, can be used for a long time,
reduce the cost of the experiment.
Frequently Asked Questions
Q1. Do you provide product samples?
Yes, we provide samples subject to availability. A nominal sample fee may apply in some cases, and shipping costs are borne by the customer.
Q2. What are your accepted payment methods?
We accept T/T (bank transfer) in advance, Western Union, Alipay, and PayPal.
Q3. What is your typical delivery lead time?
Lead times vary depending on product requirements, including material selection, dimensions, and specific manufacturing processes.
Q4. Do you perform quality inspection before shipment?
Yes, we conduct 100% inspection of all goods prior to delivery to ensure they meet specified standards.
Q5. What other ceramic materials do you offer?
We supply a range of advanced ceramic materials, including Alumina, Zirconia, Aluminum Nitride, Boron Nitride, Silicon Nitride, Machinable Glass Ceramic, and related specialized ceramics.
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