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'iPhone 6s' Materials Analysis Confirms Stronger, Less Bendable Aluminum Alloy
Increasingly reliable reports of 7000 Series aluminum for the iPhone 6s followed by hands-on impressions of a "stronger body" and ultimately some measurements showing thickening of the shell's weak points have all pointed toward Apple making some changes to improve the strength and durability of the next iPhone.
MacRumors has recently received data on the elemental composition of the iPhone 6s shell, revealing that the aluminum alloy being used by Apple does indeed include roughly 5 percent zinc, which is in line with many 7000 Series alloys and not found in the iPhone 6 shell. A just-published video from Unbox Therapy is showing similar results, as well as test results showing a significantly stronger body more resistant to bending.
Interestingly, the data we received showed high iron levels of around 8 percent on average, although the iron composition varies significantly among test samples. Unbox Therapy, however, is not seeing particularly high levels of iron in its sample.
We've been told that some iron can be introduced into the shell during the milling process, which can account for some of the variability in measurements shared with MacRumors. The small quantities of iron at levels seen by Unbox Therapy can be used to enhance durability and make the material easier to work with during the casting process.
As shown in electron microscope images shared with MacRumors, the iPhone 6s shell is covered with a roughly 10-micron thick anodized aluminum oxide layer to help protect against corrosion. The anodization layer also enables Apple to introduce dyes for various color options.
Unbox Therapy also subjected the iPhone 6 and 6s shells to bending tests, finding that while the iPhone 6 shell began experiencing significant bending at roughly 30 pounds of pressure, the iPhone 6s shell withstood at least twice as much pressure before bending.
Apple is expected to unveil the iPhone 6s and 6s Plus at a media event on September 9. If tradition holds, the company would begin taking pre-orders a few days later and officially launch the new phone on Friday, September 18. The iPhone 6s should appear largely identical to the iPhone 6 but contain a number of hardware upgrades including Force Touch support, a new A9 chip with 2 GB of RAM, camera improvements, and more. A new rose gold or pink color option has also been rumored.