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Formula: Al₂O₃ 99.9
Form: Powder
Material: Sapphire
CAS Number: 1344-28-1
Commodity: Ceramics
Max Particle Size: 60μm
Sapphire Powder is a high purity aluminum oxide powder offered in our range of advanced ceramic materials. With 20 size variations to choose from, it enables precision control over ceramic fabrication. Its extreme hardness, thermal conductivity and chemical resistance makes this powder ideal for applications like scratch-resistant coatings and high-performance bearings. By taking advantage of our broad selection of Sapphire Powder options, manufacturers can use the optimal composition for their needs
Technical Data Sheet Safety Data Sheet Tolerance Properties
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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 7.5-11.5
Dielectric strength( kV mm⁻¹ ) 15-50
Volume resistivity( Ohmcm ) >10¹⁴@25
Physical Properties
Element Value
Refractive index 1.71-1.79
Useful optical transmission range 200-5500nm
Apparent porosity( % ) 0
Water absorption - saturation( % ) 0
Density( gcm⁻³ ) 3.985
Thermal Properties
Element Value
Melting point( C ) 2050
Upper continuous use temperature( C ) 1800-1950
Specific heat( J K⁻¹ kg⁻¹ ) 750@25°C
Thermal conductivity( W m⁻¹ K⁻¹ ) 35-40@20°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) 5.8@20-1000°C
Mechanical Properties
Element Value
Tensile modulus( GPa ) 350-390
Hardness - Knoop( kgf mm⁻² ) 2000
Hardness - Vickers( kgf mm⁻² ) 1600-1800
Tensile strength( MPa ) 250-400
Pultrusions
Element Value
Compressive strength( MPa ) 2100

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