Sapphire domes are used when a full range of view is needed in a harsh environment. Cameras or sensors are placed up inside the dome allowing them to see all around them.Sapphire has the characteristic of high hardness,hign strength, high transmittance,with high resistance to thermal shock quality factor, excellent performance on themal-shock resistance and abrasion resistance.
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Mechanical |
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Density(g/cm3) |
3.98 g/cm3, (0.143 lbs./in3) |
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Young’s modulus(Gpa) |
400 GPa @ 20°C |
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Hardness(kg/cm2) |
800 |
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Tensile Strength |
300 to 400 MPa |
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Point Group; Symmetry |
3 2/m; [C,1A3, 3A2, 3P] |
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Lattice Dimensions |
a = 4.748 Angstroms, c = 12.957 Angstroms |
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Sound Speed |
～10 km/s |
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Thermal |
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Melting point(/℃) |
2053°C (3727°F) |
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Most properties useful to (maximum) |
1800°C (3272°F) |
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Conductivity |
40 W/M°K @ 298°K |
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Expansion @ 25°C |
4.5×10-6/K-1 and @ 1000°C: 9.0×10-6/K-1 (90° orientation) |
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Specific Heat Capacity |
750 J/K at 300°K |
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Viscosity @ 2053°C |
0.0584 Pa•s |
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Electrical Properties |
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Bulk Resistivity |
1016 ohm-cm @ 25°C, 1011 ohm-cm @ 500°C |
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Dielectric Strength |
48 kv/mm, (1.2kv/mil) |
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Dielectric Constant 25°C |
9.4 perpendicular to the c-axis, 11.6 parallel to the c-axis between 10Hz and 3×109 Hz |
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Loss Tangent 25°C |
3.0 – 8.6×10-5; between 10 Hz and 3×109 Hz |
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Magnetic Susceptibility |
-0.21×10-6 to -0.25×10-6 |
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