| Refractoriness (℃): | 1770< Refractoriness< 2000 |
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| Feature: | Long Time Materials |
| Type: | Refractory Material |
| Shape: | Cylindrical Crucible |
| Material: | High Pure Alumina |
| Transport Package: | Wooden Box |
| Samples: |
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| Customization: |
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Audited Supplier High pure alumina (Al2O3) Crucible for thermal analysis. Inert to hydrogen, carbon and refractory metals; can be used at operating temperatures to 1650°C in both oxidizing and reducing atmospheres.
Alumina ceramic crucibles for thermal analysis
Heating and Cooling Instructions
Alumina is sensitive to thermal shock. Try to warm up the furnace chamber slowly. Heating rate of 150-300°C per hour is recommended for the first 1-1.5 hours to reduce the impact of thermal shock.
Lower the temperature as gradually as possible. Cooling down rate is often half of the heating rate (75-150°C per hour). If possible, arrange for consecutive heating of furnace to maintain a hot crucible. If taking the crucibles out of furnace into room temperature to pour the melted material, try to make the process as gradual as possible.
Alumina Ceramic Crucibles Capacity: 5-1500ml, maximum capacity can be customized.
Materials Physical and Chemical Index
| Item | Unit | AL99.7% | AL99 | AL95 |
| Al2O3 content | - | 99.7% | 99% | 95% |
| Color | - | Ivory white | Ivory white | Ivory white,white |
| Air tightness | - | airtight | airtight | airtight |
| Density | g/cm3 | 3.94 | 3.8 | 3.7 |
| Straightness | - | 2‰ | 2‰ | 2‰ |
| hardness | Moh's hardness | 9 | 9 | 8.8 |
| Water absorption | ≤0.2 | ≤0.2 | ≤0.2 | ≤0.2 |
| Flexural strength(20ºC) | Mpa | 375 | 340 | 304 |
| Compressive strength(20ºC) | Mpa | 2300 | 2210 | 1910 |
| Thermal expansion coefficient (25ºC-800ºC) | 105/ºC |
7.6 | 7.6 | 7.6 |
| Insulation strength(thickness:5mm) | AC-kv/mm | 10 | 10 | 10 |
| Dielectric loss 25ºC@1MHz | - | <0.0001 | <0.0006 | <0.0004 |
| Volume resistivity (20ºC) (300ºC) |
Ω·cm3 |
>1014 >1010 |
>1014 >1010 |
>1014 >1012 |
| Long-term use temperature | ºC | 1700 | 1600 | 1200 |
| Thermal conductivity(25ºC) | W/moK | 35 | 34 | 20 |
Excellent performance of our alumina ceramic products:
1.Excellent performance of high temperature resistance
2.Excellent performance of wear resistance
3.Stable chemical properties
4.High degree of corrosion resistance
5.Super high insulativity
6.High mechanical strength
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Audited Supplier 
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