Both the 4.7-inch and 5.5-inch iPhones have been constructed using 7000 Series Aluminium which is the strongest known grade to be used to build phones. Apple's iPhone 6 and 6 Plus which were launched two years ago quickly ran into trouble as they failed bend tests and the larger handset apparently used to bend on its own.
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JerryRigEverything subjected a black iPhone 7 to a series of tests to measure its durability and Apple's claims of the handset being scratchproof. To begin with, the sapphire glass display turned out to be similar to those of most premium phones, resisting scratches towards the edges but suffering some in the middle. The home button, which Apple claims is made from Sapphire, resisted initial scratches but when subjected to deeper scratches which sapphire can resist but glass can't, it showed up a few scratches which proved that it is definitely not sapphire.
The Aluminium back of the iPhone also turned out to be quite scratch-resistant when scratched by a sharp key end but the YouTube user decided to subject it to long cuts with a sharp razor. If the cuts didn't appear, then that would definitely have caused a surprise. Scratch resistance can be tested against keys, metal pieces, coins or even pens but trying a thick-blade razor on the phone is basically asking for too much.
The user then tried out the razor on the circular glass screen which shields the rear camera lens. After some moments of deep scratching, which in normal parlance an iPhone 7 may not suffer, the glass cover showed up a few scratches which the user then said proves that it isn't sapphire but a strong glass material.
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JerryRigEverything followed up the scratch test with a burn test. He basically lit a lighter an inch away from the iPhone's display screen to see what happens. After ten seconds of being subjected to a flame, the display pixels turned black but within seconds of the flame being turned off, the screen recovered and functioned like any iPhone display. JerryRigEverything adds that that is a great advantage given that Samsung's AMOLED display turns white when subjected to a flame and does not recover.
The iPhone 7 handset was then subjected to a bend test under extreme pressure from both ends. While bending the iPhone, JerryRigEverything discovered that the waterproof layering between the display and the rest of the body loosened up a bit which meant that while the iPhone is still durable or may not suffer from 'bendgate', it is still not immune from being bent by force.