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Formula: Al₂O₃
Form: Tube
Material: Alumina
CAS Number: 1344-28-1
Commodity: Ceramics
Goodfellow's Alumina Tube is a high-performance ceramic product designed for applications requiring excellent thermal and chemical resistance. Made from high-purity aluminum oxide (Al₂O₃), these tubes offer exceptional stability at temperatures up to 1800°C and remarkable resistance to corrosion from most acids and alkalis. Their low thermal expansion coefficient ensures dimensional stability across a wide temperature range, making them ideal for use in high-temperature environments. Alumina tubes find extensive applications in industries such as aerospace, electronics, and advanced materials processing. They are commonly used as protective sheaths for thermocouples, as insulating components in high-temperature furnaces, and as reaction vessels in chemical processing. In cutting-edge applications, these tubes are utilized in the development of solid oxide fuel cells, as substrates for growing single crystals, and in the production of advanced ceramic composites. In research settings, alumina tubes play a crucial role in studying material behavior under extreme conditions and in developing new high-temperature processes. Their combination of thermal stability, chemical inertness, and mechanical strength makes them invaluable in both scientific exploration and industrial innovation, particularly in fields pushing the boundaries of material performance in harsh environments.
Technical Data Sheet Safety Data Sheet Tolerance Properties
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Tolerances

Tube
Outside Diameter =<2mm ±10%
Outside Diameter =<5mm ±10%
Outside Diameter >5mm ±10%
Wall Thickness ±20%

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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