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Frequently Asked Questions

The product being described is EOT Sapphire.

The mechanical properties of Sapphire include a Young Modulus of 345 GPa, Shear Modulus of 145 GPa, Bulk Modulus of 240 GPa, Knoop Hardness of 22 GPa, Mohs Hardness of 9, Vickers Hardness of 1570...1750, Modulus of Rupture of 420 MPa at 20°C, and Apparent Elastic Limit of 275 MPa.

The thermal properties of Sapphire include a Melting Point of 2030°C, Specific Heat of 105 J/kg.°C at -182.15°C and 761 J/kg.°C at 17.85°C, Coefficient of thermal expansion of 6.66 x 10-6 K-1 // c axis at 50°C and 5 x 10-6 K-1 ┴ c axis at 50°C, and Thermal conductivity of 10000 (W/m·°C) at -243°C, 40 (W/m·°C) at 27°C, and 4 (W/m·°C) at 1227°C.

The electrical properties of Sapphire include a Resisitiviy of 1016 Ω-cm at 27°C and 1011 Ω-cm at 300°C, Dielectric resistance at 60Hz of 48x106 V/m, Dielectric Strength of 17kV/mm, Dielectric Costant of 10.6 // c axis at 27°C ; 106Hz and 8.6 ┴ c axis at 27°C ; 106Hz, and Loss coefficient of < 103 at 27°C.

The optical properties of Sapphire include a Transmittance that is excellent in the visible, with >85% from 0.75μm to 4.5μm and >60% from 0.25μm to 0.4μm, Refractive Index of n0 = 1.7717 and ne = 1.76355 at 50.532μm, Emissivity of < 0.02 @ 880°C; λ = 2.6 at 3.7μm, and dn/dt of 13 x 10-6K-1 1/2.

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