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Alumina Point Bottom Crucible

Formula: Al₂O₃
Form: Crucible
Material: Alumina
CAS Number: 1344-28-1
Commodity: Ceramics
Purity: 99.8%
The Alumina Point Bottom Crucible from Goodfellow is a specialized ceramic vessel designed for precise high-temperature applications. Crafted from high-purity aluminum oxide (Al₂O₃), it offers exceptional thermal stability up to 1800°C and excellent chemical inertness, ensuring minimal contamination during experiments or processes. The pointed bottom design facilitates the concentration of heat and allows for more efficient stirring of molten materials, making it ideal for applications requiring thorough mixing or rapid heating. These crucibles find extensive use in metallurgy, materials science, and chemical analysis industries. They are particularly valuable in applications such as metal alloy preparation, glass melting, and high-temperature chemical synthesis. In research settings, these crucibles play a crucial role in developing new materials, studying phase transitions, and investigating the behavior of substances at extreme temperatures. Their unique design and reliability make them indispensable tools for both industrial processes and academic research, especially in fields pushing the boundaries of material science and high-temperature chemistry.
Technical Data Sheet Safety Data Sheet Tolerance Properties
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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

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