As the hardest one of all the oxide crystals, sapphire has the combination of optical and physical properties that makes it the best choice for a variety of demanding applications. Sapphire maintains its strength even at high temperatures..
Sapphire has good thermal properties, excellent electrical and dielectric properties and is resistant to chemical attack. These properties encourage the use of sapphire in aggressive environments where long-term reliability, high optical transmission or good strength is required. Through being developed for more than half a century, Al2O3 crystals have been extensively applied on an industrial scale. Synthetic sapphire has made enormous contribution to our lighting industry, national defense, aeronautics and astronautics, and also provides a strong guarantee for rapid development of the LED industry in recent years
