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Sapphire glass. Similar to the composition of steel jade, hardness of 9, can be added by various chemical elements, generate a variety of colors. Now it's colourless. Its advantages are higher than ordinary glass hardness, the price is relatively high, mainly used for the production of high-end watch mirror.
Sapphire glass/ruby glass has very good thermal characteristics, excellent electrical and dielectric properties, and chemical corrosion resistance, it is high temperature resistance, good thermal conductivity, high hardness, infrared penetration, good chemical stability. Therefore, it is commonly used to replace other optical materials to make optical components, infrared optical Windows, and is widely used in infrared and far-infrared military equipment, such as: It is used in night vision infrared and far infrared scopes, night vision cameras and other instruments and satellites, space technology instruments and instruments, as well as Windows for high-power lasers, various optical prisms, optical Windows, UV and IR Windows and lenses, observation ports for low-temperature experiments, and has been fully used in high-precision instruments and meters for navigation, aerospace and aviation.
