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Formula: Al₂O₃
Form: Powder
Material: Aluminum Oxide
CAS Number: 1344-28-1
Commodity: Ceramics
Purity: 99.99%
Particle Size D90: 0.1µm
Alumina Irregular Powder consists of high-purity aluminum oxide grains with non-uniform morphology, offering a high surface area, excellent hardness, and chemical stability. These physical traits are ideal for applications in technical ceramics, wear-resistant components, refractory materials, and thermal barrier coatings. In catalysis and surface science, its irregular particle geometry promotes enhanced adsorption and active surface availability. It’s widely employed in the fabrication of spark plugs, insulators, pump seals, and abrasive media. Alumina's dielectric strength and stability at elevated temperatures (up to 1600 °C) also support use in electronic substrates and vacuum component insulation. Compared to spherical grades, irregular alumina powder exhibits superior packing density variation and frictional locking, important in sintering behavior and mechanical interlocking. It remains a critical material in advanced ceramics manufacturing, tribological systems, and high-temperature insulation design.
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Tolerances

Powder
Mean Particle Size Nominal
Minimum Particle Size Nominal
Maximum Particle Size Nominal
Maximum Particle Size Nominal
Particle Size D10 Nominal
Particle Size D50 Nominal
Particle Size D90 Nominal

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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    Formula: Al₂O₃
    Percentage Purity: 99.999%
    Particle Size D10: 0.3µmµm
    Particle Size D50: 0.45µmµm
    Particle Size D90: 0.6µmµm
    Weight: 10000g
    Phase: Gamma
    Colour: White
    CAS Number: 1344-28-1
    UOM Code: 166-247-28

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    Formula: Al₂O₃
    Percentage Purity: 99.999%
    Particle Size D10: 0.3µmµm
    Particle Size D50: 0.45µmµm
    Particle Size D90: 0.6µmµm
    Weight: 10000g
    Phase: Alpha
    Colour: White
    CAS Number: 1344-28-1
    UOM Code: 175-103-97

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