[youtube]http://www.youtube.com/watch?v=wT8xI4PEU8c[/youtube]
Corning, producers of the famous bottle Gorilla Glass, which protects hundreds of millions of smartphones, including iPhone, shows in a video clip the process of breaking a screen, but also the hardness Gorilla Glass 2. This last product was launched especially for the smartphones of 2012, the Samsung Galaxy S III already contains it and it is speculated that the iPhone 5 will use it. The clip shows us that Gorilla Glass 2 is more resistant than any other competitor on the market, but only in the case of hits, not in the case of scratches.
Strength is the relationship between the surface compression and inner tension; it determines, among other things, how many blows a piece of glass can endure before it shatters completely. Glass only breaks in tension, when the force of impact finally overcomes the surface compression. A scratch doesn't shatter glass, but small stresses will eventually lead to a colossal splintering.
