A week ago, a video on YouTube showed the alleged front panel of the 4.7-inch iPhone 6 being put through a number of scratch tests and significant bending. Now, yet another video putting the same display through more hard scratch tests, this time with 2 differing types of sandpaper. The Mohs scale of mineral hardness in testing, which is a scale rating mineral hardness from 1-10.
The iPhone 5s’ Gorilla Glass display is rated at a 6.8, while sapphire crystal, which Apple utilizes for the iPhone 5s Touch ID home button, is rated at 9. The 2 sandpapers used for the test include garnet, which is rated at a 7 on the Mohs scale, and emery, rated a little bit above an 8. Upon testing, both types of sandpapers were able to scratch the iPhone 6’s front panel, but it did show much better resistance than the Gorilla Glass display for the iPhone 5s.
Basically, the sapphire Touch ID home button on the iPhone 5s didn’t display any marks after being scratched by the sandpaper. This would show that the claimed front panel from the 4.7-inch iPhone 6 isn’t sapphire crystal, but instead perhaps a next-generation model of Gorilla Glass. It is also possible that the panel could be a hybrid sapphire coated display, which was patented by Apple last year.