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PRODUCT DATA of Sapphire
MaterialSapphire
Product Datasheettechnical ceramics
General InformationSapphire is not only highly transparent to wavelengths of light between 150 nm (UV) and 5500 nm (IR) (the human eye can discern wavelengths from about 380 nm to 750 nm[50]), but is also extraordinarily scratch-resistant.
See also ruby, while properties are very similar
Use in Spacecraftoptical windows or covers
Product Typesapphire glass, wafers, substrates
Chemical Compositionsingle crystal Al2O3
PHYSICAL PROPERTIES
Specific Gravity3.98
ELASTIC PROPERTIES
Tensile Modulus345 GPa
Shear Modulus145 GPa
Bulk Modulus250 GPa
Poisson Ratio0.29
ELECTRICAL PROPERTIES
Electrical Volume Resistivity10e16 ohm.m
Dielectric Constant9.4
Dielectric Strength17 kV/mm
Dissipation Factor10^-4 tanδ
THERMAL PROPERTIES
Thermal Conductivity23 W/m.K @RT
Thermal Expansion Coefficient5.3 10-6 m/(m K)
Melting Range2040 °C
Specific Heat0.756 J/g.K @RT
OPTICAL PROPERTIES
Thermal Emittance0.48