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Formula: Al₂O₃
Form: Crucible
Material: Alumina
CAS Number: 1344-28-1
Commodity: Ceramics
Purity:
99.8%
Alumina Point Bottom Crucibles are a range of 8 crucibles made of high purity alumina with a point bottom design for the convenient pouring of molten contents. They possess excellent thermal shock resistance and high temperature strength. The range includes crucibles with volumes from 5mL to 100mL and maximum service temperatures from 1600°C to 1700°C. Alumina crucibles are commonly used in laboratories and industry for high temperature melting, annealing and sintering applications such as metal alloy processing or ceramic and glass making.
Tolerances
Point Bottom
| Outer Diameter | ±10% | |
|---|---|---|
| External Height of Cylinder | ±10% | |
| External Height Overall | ±10% | |
| Internal Height Overall | ±10% | |
| Internal Diameter at Top | ±10% | |
| Outer Diameter Bottom | ±10% |
Material Properties for Ceramics
Chemical Resistance
| Element | Value |
|---|---|
| Acids - concentrated | Good |
| Acids - dilute | Good |
| Alkalis | Good |
| Halogens | Good |
| Metals | Good |
Electrical Properties
| Element | Value |
|---|---|
| Dielectric constant | 9-10.1 |
| Dielectric strength( kV mm⁻¹ ) | Oct-35 |
| Volume resistivity( Ohmcm ) | >10¹⁴@25 |
Physical Properties
| Element | Value |
|---|---|
| Apparent porosity( % ) | 0 |
| Water absorption - saturation( % ) | 0 |
| Density( gcm⁻³ ) | 3.9 |
Thermal Properties
| Element | Value |
|---|---|
| Melting point( C ) | 2100 |
| Upper continuous use temperature( C ) | 1700 |
| Specific heat( J K⁻¹ kg⁻¹ ) | 850-900@25°C |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 26-35@20°C |
| Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) | 8@20-1000°C |
Mechanical Properties
| Element | Value |
|---|---|
| Tensile modulus( GPa ) | 300-400 |
| Hardness - Knoop( kgf mm⁻² ) | 2100 |
| Hardness - Vickers( kgf mm⁻² ) | 1500-1650 |
| Shear strength( MPa ) | 330 |
| Tensile strength( MPa ) | 260-300 |
Pultrusions
| Element | Value |
|---|---|
| Compressive strength( MPa ) | 2200-2600 |