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Formula: Al₂O₃
Form: Rod
Material: Alumina
CAS Number: 1344-28-1
Commodity: Ceramics
Goodfellow's Alumina Rod is a high-purity aluminum oxide (Al₂O₃) product designed for applications requiring excellent thermal and electrical insulation properties. These rods exhibit remarkable hardness, wear resistance, and dimensional stability even at temperatures up to 1800°C. Their low thermal expansion coefficient ensures they maintain their shape and properties across a wide temperature range, making them ideal for use in high-temperature environments. Alumina rods find extensive applications in industries such as electronics, aerospace, and advanced manufacturing. They are commonly used as insulators in high-temperature furnaces, as spacers in vacuum systems, and as wear-resistant components in machinery. In cutting-edge applications, these rods are utilized in the development of advanced sensors, as substrates for thin-film deposition, and in the production of specialized ceramic tools. In research settings, alumina rods play a crucial role in studying material behavior under extreme conditions and in developing new ceramic composites. Their combination of thermal stability, electrical insulation, 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

Rod
Diameter +20% / -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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