'iPhone 6s' Materials Analysis Confirms Stronger, Less Bendable Aluminum Alloy

Back in April, we first heard rumors about Apple planning to use 7000 Series aluminum alloys for the upcoming "iPhone 6s," taking advantage of some of the expertise gained in using the material for the Apple Watch Sport to make for a stronger iPhone body compared to the 6000 Series aluminum used on the iPhone 6 and 6 Plus. That device received significant "Bendgate" attention after some early users found the device bending slightly under pressure in their pockets.

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.

iphone_6s_shell_samples

Sample points on milled surface of iPhone 6s rear shell

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.

iphone_6s_shell_composition

Elemental composition at each sample point

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.

iphone_6s_anodize

Scanning electron microscope image showing 10-micron anodization with lighter aluminum color above. Chipped particle can also be seen.

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.

Related Forum: iPhone

Popular Stories

Generic iOS 19 Feature Mock Light

iOS 19 Leak Reveals All-New Design

Friday January 17, 2025 2:42 pm PST by
iOS 19 is still around six months away from being announced, but a new leak has allegedly revealed a completely redesigned Camera app. Based on footage it obtained, YouTube channel Front Page Tech shared a video showing what the new Camera app will apparently look like, with the key change being translucent menus for camera controls. Overall, the design of these menus looks similar to...
2024 iPhone Boxes Feature

Apple Changes Trade-In Values for iPhones, iPads, Macs, and More

Thursday January 16, 2025 6:45 am PST by
Apple today adjusted estimated trade-in values for select iPhone, iPad, Mac, and Apple Watch models in the U.S., according to its website. Some values increased, while others decreased. The changes were not too significant, with most values rising or dropping by $5 to $50. We have outlined some examples below: Device New Value Old Value iPhone 15 Pro Max Up to $630 U ...
2024 App Store Awards

Apple Explains Why It Removed TikTok From the App Store in the U.S.

Sunday January 19, 2025 6:58 am PST by
Apple on late Saturday removed TikTok from the App Store in the U.S., and it has now explained why it was required to take this action. Last year, the U.S. passed a law that required Chinese company ByteDance to divest its ownership of TikTok due to potential national security risks, or else the platform would be banned. That law went into effect today, and companies like Apple and Google...
Generic iOS 18

Everything New in iOS 18.3 Beta 3

Thursday January 16, 2025 12:39 pm PST by
Apple provided the third beta of iOS 18.3 to developers today, and while the betas have so far been light on new features, the third beta makes some major changes to Notification Summaries and also tweaks a few other features. Notification Summary Changes Apple made multiple changes to Notification Summaries in response to complaints about inaccurate summaries of news headlines. For...
iOS 19 Roundup Feature

iOS 19 Rumored to Be Compatible With These iPhones

Saturday January 18, 2025 10:28 am PST by
iOS 19 will not drop support for any iPhone models, according to French website iPhoneSoft.fr. The report cited a source who said iOS 19 will be compatible with any iPhone that can run iOS 18, which would mean the following models: iPhone 16 iPhone 16 Plus iPhone 16 Pro iPhone 16 Pro Max iPhone 15 iPhone 15 Plus iPhone 15 Pro iPhone 15 Pro Max iPhone 14 iPhon...
iPad Pro vs iPhone 17 Air Feature

Here's How Thin the iPhone 17 Air Might Be

Friday January 17, 2025 3:38 pm PST by
For the last several months, we've been hearing rumors about a redesigned version of the iPhone 17 that Apple might call the iPhone 17 "Air," or something along those lines. It's going to replace the iPhone 17 Plus as Apple's fourth iPhone option, and it will be offered alongside the iPhone 17, iPhone 17 Pro, and iPhone 17 Pro Max. We know the iPhone 17 Air is going to be super slim, but...
mail categories macos

Apple's Redesigned Mail App is Expanding to the Mac — Here's When

Sunday January 19, 2025 6:02 am PST by
Apple plans to expand the iPhone's redesigned Mail app to the Mac starting with macOS 15.4, according to Bloomberg's Mark Gurman. The first macOS 15.4 beta should be made available in the coming weeks, and Apple has previously suggested that the iOS 18.4, iPadOS 18.4, and macOS 15.4 series of software updates will be released to the public in April. The revamped Mail app debuted on all...
apple power beats pro 2

Powerbeats Pro 2 Coming Soon: Apple to Announce Them 'Imminently'

Sunday January 19, 2025 8:25 am PST by
In September, Apple said that it would be launching Powerbeats Pro 2 in 2025, and it appears the wireless earbuds are coming very soon. Powerbeats Pro 2 images found in iOS 18 code In his Power On newsletter today, Bloomberg's Mark Gurman said the Powerbeats Pro 2 are "due imminently." In addition to Apple filing the Powerbeats Pro 2 in regulatory databases last month, Gurman said Apple is...

Top Rated Comments

AngerDanger Avatar
123 months ago
That device received significant "Bendgate" attention after some early users found the device bending slightly ('https://www.macrumors.com/2014/09/23/iphone-6-plus-bending-pockets/') under pressure in their pockets.
I'm just waiting to see what term is chosen if the iPhone ever has an issue pertaining to water.
Score: 29 Votes (Like | Disagree)
Flow39 Avatar
123 months ago
Milking the #bendgate issue, one video at a time.
Score: 17 Votes (Like | Disagree)
mejsric Avatar
123 months ago
This guy again... wait.. Let me turn on AdBlock first before playing YouTube...
Score: 17 Votes (Like | Disagree)
DTphonehome Avatar
123 months ago
Now THIS is a teardown. Please count the electrons and confirm which elements are present.
Score: 17 Votes (Like | Disagree)
darcyf Avatar
123 months ago
For all you doubters out there:

My 6+ bent within the first week or two of ownership. That was just from being in my back pocket sitting in my office chair or car seat. Functioned while bent for about 8 months before the touch-sensitivity of the screen started getting flaky.

Went to the Apple store, and I actually had to pay them for a new phone, even with AppleCare, for what was clearly a design flaw. :mad:
You repeatedly sat on your 6+ in a car seat and an office chair and you think there's a flaw in the phone?
Score: 11 Votes (Like | Disagree)
NissanGuy23 Avatar
123 months ago
If only 9 iPhone 6 and 6 Pluses ever bent I don't see why they are spending so much time and money reengineering the case.
Its just to shut up the people spreading the bendgate nonsense. Its for marketing reasons. Its Apple saying "look, we strengthened it case" even thought nobody ever really had a problem with it. Or that's my take at least.
Score: 10 Votes (Like | Disagree)