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   <video:description>Customized Rectangle sapphire step glass lens sapphire wafer plate window lenses Specification for Optical Sapphire Window: Sapphire is a single crystal aluminum oxide (Al2O3). It is one of the hardest materials. Sapphire has good transmission characteristics over the visible, and near IR spectrum. It exhibits high mechanical strength, chemical resistance, thermal conductivity and thermal stability. It is often used as window materials in specific field such as space</video:description>
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