What Is Sapphire Glass

Sapphire glass, except for its cost, has some incredibly desirable qualities. It’s highly transparent between 150nm (ultraviolet) and 5500nm (far-infrared), much stronger than normal glass, and it’s one of the most scratch-resistant materials in the world — it scores 9 on the Mohs scale, one down from diamond’s 10, and quite a lot tougher than Gorilla Glass’s ~7. Its transparency, plus its very high melting temperature (~2,000C) and high thermal conductivity, make it almost uniquely suited for use in arc lamps, laser tubes, and other extreme use-cases. Oh, it’s highly resistant to acids and other caustic substances, too.

In short, it’s an amazing material that’s almost perfectly suited to the front face of the iPhone 6 or iWatch — as long as it can be produced economically. Presumably, with Apple’s recent investment in GT Advanced Technologies, and plans to begin sapphire glass production at a plant in Arizona, the folks in Cupertino believe it’s possible.


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