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    HOME > Glass >
    Sapphire

    Sapphire

    Sapphire Glass Substrates & Windows

    Synthetic single-crystal sapphire (Al₂O₃) is a premium optical material known for its extreme physical hardness, exceptional chemical durability, and broad spectral transmission band spanning from ultraviolet to mid-infrared wavelengths.

    Functions:
    Features an outstanding Mohs hardness of 9 (second only to diamond), offering superior scratch resistance, high thermal conductivity, and extreme resistance to thermal shock, high operational temperatures, and aggressive chemical environments.

    Applications:
    High-precision instrument viewports
    Watch crystals
    Optical sensor cover glass
    Aerospace and defense viewports
    High-pressure sight glasses
    Infrared optical windows
    Protective covers for harsh operational environments

     sapphire,rocoes

    ITEM NO:SAPPHIRE

    Spectral Characteristics

    Tave>85% @ 400-700nm

    Physical Characteristics

    0.6, 1.0, 2.0, 3.0mm (Customizable thickness)

    Square: 8x8 - 100x100mm

    Round: Dia8 - 100mm

    Resistant Temperature

    450℃

      

    Sapphire Material Properties & Physical Specifications
    Physical Properties Crystal Structure Single Crystal (Hexagonal / Corundum Structure)
    Chemical Formula Al2O3 (α-Alumina)
    Trace Impurities Na, Si, Ca, Fe, Ga, Mg, Ti, Mn, Pb, Cu, Zn, Ni, Cr
    Density 3.98 – 3.99 g/cm3
    Thermal Properties Melting Point 2320 K (approx. 2047°C)
    Softening Point 2070 K (approx. 1797°C)
    Thermal Expansion Coefficient 6.2 × 10-6 / K (@ 300 K)
    Mechanical Properties Hardness Mohs 9 (Scratch Hardness)
    Optical & Electrical Properties Refractive Index (n @ 589.3 nm) 1.768 (Ordinary Ray, no — Parallel to C-axis)
    1.760 (Extraordinary Ray, ne — Perpendicular to C-axis)
    Volume Resistivity 1011 Ω·cm (@ 770 K)
    106 Ω·cm (@ 1270 K)
    103 Ω·cm (@ 2270 K)

    ROCOES strives to keep the website information accurate and up to date. Specifications are subject to change without prior notice; final products delivered comply with agreed quality standards.
       
    Information and Notes

    1. Mohs Hardness Scale: Defined by German mineralogist Friedrich Mohs in 1812, the Mohs scale measures mineral scratch resistance using a standardized diamond-stylus scratch test. The reference minerals rated from 1 to 10 are:

    • 1. Talc
    • 2. Gypsum
    • 3. Calcite
    • 4. Fluorite
    • 5. Apatite
    • 6. Orthoclase / Feldspar
    • 7. Quartz
    • 8. Topaz
    • 9. Corundum (Synthetic Sapphire)
    • 10. Diamond

    2. Custom geometrical profiles, non-standard thicknesses, precision CNC edging, drilling, and custom shaping are available upon request. For additional details, please refer to our Glass Processing Services.

    3. Spectral transmittance curves represent measurements at normal incidence (0° angle of incidence).

    4. For applications requiring maximized light throughput, please refer to our Anti-Reflective (AR) Coating Solutions.

    5. Website specifications are provided for reference only. Final production and delivery comply with mutually agreed engineering specifications.
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