Source: http://gizmodo.com/5726124/what-is-gorilla-glass
Gorilla Glass is, well, glass...
You'll find it in screens, mostly. This includes smartphone screens, tablet screens, laptop screens, and as of this week, touch-table screens and TV screens.
...that's pretty tough to break or scratch...
Drop it, smack it, or shoot it with an air rifle, and chances are you won't break, or even scratch, a piece of Gorilla Glass. Our own Brian Barrett went hands-on with a panel some time ago, and came away impressed:
Gorilla Glass is an unscratchable, unshatterable material used as a protective window for your mobile phone, PMP, or laptop display. It's in 65 products already, and I can assure you that the very nice man from Corning is not faking it. Your intrepid reporter also gave this several tries with all his blogger strength, and couldn't make a dent. I was, however, able to scratch the heck out of some polycarbonate.
Ok, so it's not literally indestructible, and it still quite possible to shatter your iPhone's screen. But it's harder than it used to be.
...because it's treated differently than most other gadget glass.
Speaking to SmartPlanet, Gorilla Glass engineer Dr. Donnell Walton explains:
When you chemically temper a glass, you immerse it in a salt bath and you stuff larger ions in all the surfaces and put them all under compression.
What's unique about Gorilla Glass is that because of its inherent composition, it can allow those larger ions to penetrate the surface more deeply to increase the compression tolerance and tolerate deeper scratches.
The compression pushes a flaw back. It's harder to break from a deeper scratch.
It's also a bit more expensive than the glass normally used for gadget screens, though given its rapid adoption—it's used in some 300+ devices at this point—its value as a selling point and feature clearly outweighs its monetary cost.
For more on Gorilla Glass, read our previous coverage.