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Formula: Al₂O₃
Form: Bead
Material: Alumina
CAS Number: 1344-28-1
Commodity: Ceramics
Goodfellow's Alumina Sheet is a versatile product made from high-purity aluminum oxide (Al₂O₃), known for its exceptional thermal and electrical insulation properties. These sheets exhibit remarkable hardness and wear resistance, making them ideal for applications requiring durability under extreme conditions. Their low thermal expansion coefficient ensures dimensional stability across a wide temperature range, up to 1800°C. Alumina sheets find extensive use in industries such as electronics, aerospace, and advanced manufacturing. They serve as substrates for electronic circuits, thermal barriers in high-temperature furnaces, and wear-resistant components in machinery. In cutting-edge applications, these sheets are utilized in the production of solid-state batteries and as protective layers in plasma-facing components for fusion reactors. In research settings, alumina sheets play a crucial role in developing new ceramic composites and studying material behavior under extreme conditions. 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.
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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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    Percentage Purity: 99.999%
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    Phase: Gamma
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    CAS Number: 1344-28-1
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