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Formula: Al₂O₃ 99.9
Form: Disk
Material: Sapphire
CAS Number: 1344-28-1
Commodity: Ceramics
Thickness: 3mm
Diameter: 25mm
Surface Finish: Polished on Both Sides
Sapphire disks are high-quality monocrystalline aluminum oxide disks that we offer in a choice of 1 variations. Known for its extreme hardness, high strength and broad optical transparency, sapphire is prized for applications like scratch-resistant windows, high-performance bearings and precision optics. Our range of Sapphire disks enable engineers and scientists to prototype and test a diverse array of designs and concepts.
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Tolerances

Disk
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 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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