Sapphire Disk

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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Technical Data Sheet Safety Data Sheet Tolerance Properties

each

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