Corning Is Being ‘Unclear’ About Sapphire iPhones


It's the rumor pretty much every Apple analysts and blogger in the world predicted for the last 8 months and everyone got it wrong.
It's the rumor pretty much every Apple analysts and blogger in the world predicted for the last 8 months and everyone got it wrong.


Corning — or at least a representative executive of said company — did its best this week to shatter excitement around Apple’s Sapphire embrace — or, at least, make the benefits of Apple’s glass strategy less clear.

Corning Glass senior vice president Tony Tripeny laid on the FUD (fear, uncertainty and doubt) pretty thick during a Morgan Stanley conference this week.

Here’s what Corning doesn’t want you to know about sapphire iPhones. 

Tripeny didn’t mention Apple by name, but it was a transparent reference to the Cupertino giant, which used to be a valued partner. Apple has used Corning’s Gorilla Glass for past iPhones, and is expected to switch to sapphire for future iPhones.

Here’s what Tripeny said:

“We see a lot of disadvantages of Sapphire versus Gorilla Glass. It’s about 10 times more expensive. It’s about 1.6 times heavier. It’s environmentally unfriendly. It takes about 100 times more energy to generate a Sapphire crystal than it does glass. It transmits less light which…means either dimmer devices or shorter battery life. It continues to break. I think while it’s a scratch resistant product it still breaks and our testing says that Gorilla Glass [can take] about 2.5 times more pressure that it can take…Sapphire on. So when we look at it, we think from an overall industry and trend that is not attractive in consumer electronics.”

He went into other details about why it’s more expensive, details irrelevant to the topic post, which is precisely how Tripeny is either misleading us or is himself misinformed.

I’m going to give you my thoughts what Tripeny isn’t telling us here, but first let’s take a quick look at Apple’s history with Gorilla Glass.

How Steve Jobs Convinced Corning to Make Gorilla Glass

Gorilla Glass probably exists because Apple needed it for the iPhone.

We learned this from the author of a Steve Jobs biographer, Walter Isaacson. In a 2011 interview with Fortune Senior Editor at Large Adam Lashinsky, Isaacson told this story, which he learned not from Jobs, but from the CEO of Corning:

Steve Jobs needed glass for the iPhone stronger than anything then available. So he “flies to Corning, New York, sits there in front of the CEO, Wendell Weeks, and says, ‘This is what I want, a glass that can do this.’ So, Wendell Weeks says, ‘We once created a type of process that created something called Gorilla Glass.’ And Steve said, ‘No, no, no. Here’s how you make really strong glass.’ And Wendell says, ‘Wait a minute, I know how to make glass. Shut up and listen to me.’ And Steve, to his credit, shuts up and listens, and Wendell Weeks describes a process that makes Gorilla Glass. And Steve then says, ‘Fine. In six months I want enough of it to make–whatever it is–a million iPhones.’ And Wendell says, ‘I’m sorry, we’ve actually never made it. We don’t have a factory to make it. This was a process we developed, but we never had a manufacturing plant to do it.’ And Steve looks at him and says what he said to Woz, 20, 30 years earlier: ‘Don’t be afraid, you can do it.’ Wendell Weeks tells me… Because I flew to Corning, because I just wanted to hear this story. Wendell Weeks tells me, ‘I just sat there and looked at the guy. He kept saying, ‘Don’t be afraid. You can do this.'”

And Jobs was right: Corning could do it, and they did. Corning later improved the product, too, making it stronger and lighter. It ended up being sold to a wide variety of customers, not just Apple.

All was well in Corning, New York, until Apple found what the company believes is a better alternative: sapphire.

Why We Believe Apple Is Moving to Sapphire

To the best of my knowledge, there is no definitive proof that Apple will use Sapphire in future iPhones. However, the circumstantial evidence is strong.

For starters, Apple appears to be hoarding sapphire. The company built what is apparently a sapphire manufacturing plant in Mesa, Arizona.

It’s pretty clear that Apple is going to be using a lot of sapphire in future products. It’s a little less clear that this sapphire is going to become part of future iPhone screens. But it’s likely and there’s tons of evidence for it.

Ironically, Tony Tripeny’s comments can be safely added to the circumstantial evidence list.

How Corning Is Being Unclear About Apple’s Sapphire Prospects

Corning’s Tripeny is essentially trying to create the perception that Corning knows something about Sapphire that Apple doesn’t. They’ve studied the issue, and concluded that Sapphire is just no good for smartphone displays. Apple, we are expected to believe, is simply deluded about the benefits and risks of using Sapphire, and if they knew what Corning knows, they’d abandon their delusions about sapphire and come rushing back to Corning, New York, and place a big order.

In fact, either Apple knows something about sapphire that corning does not, or — more likely — Corning is being disingenuous about what it knows about what Apple knows.

Tripeny made six claims about the benefits of Gorilla Glass over Sapphire:

  1. Sapphire is about 10 times more expensive than Gorilla Glass
  2. Sapphire is about 1.6 times heavier than Gorilla Glass
  3. Sapphire transmits less light than Gorilla Glass
  4. Sapphire is environmentally unfriendly
  5. Sapphire, though scratch resistant, still breaks
  6. Gorilla Glass can take about 2.5 times more pressure than Sapphire can

We can dispense with claims 1 – 3 quite easily. Tripeny is using the most common logical or argumentation fallacy in the book. In the United States, it’s called the strawman argument and in the UK, it’s called an Aunt Sally. The fallacy is to misrepresent your opponent’s claim, then argue against your own misrepresentation.

Tripeny is arguing in each of these points against the use of sapphire as the sole protective glass on the iPhone. Surely he is aware of the fact that Apple has patents on a range of technologies called “Sapphire Laminates.” This is the use of a very thin layer of sapphire bonded to glass.

Also: Apple’s sapphire partner, GT Advanced Technologies, recently acquired a company called Twin Creeks. That company’s ion cannon technology can make sheets of sapphire thinner than a human hair.

The use of laminates with glass, rather than all sapphire, makes sapphire far cheaper, lighter and more light transmitting.

The fact that Corning’s executive didn’t even mention this overwhelming probability shows how disingenuous he’s being.

But even if Apple didn’t use its own sapphire laminates technology, the additional costs, weight and light transmission are hardly fatal.

For example, a piece of Gorilla Glass used to make an iPhone costs about $3, whereas (according to Apple’s sapphire partner, GT Advanced Technologies) a comparable slab of sapphire costs between $9 and $12.

Using these numbers, the additional price of a sapphire iPhone could be as little as $6 more for Apple to make or as much as $9 more. It’s also worth noting that the cost to make sapphire is dropping fast, and Apple itself may be innovating ways to bring it down even further using its massive economies of scale.

If, however, the technology really does significantly reduce the number of screens Apple has to replace at its own expense, the change pays for itself to some unknown degree. It could even make iPhones more profitable overall.

So the cost argument is misleading. And if it’s not, it’s an exaggeration to say that the increased price is prohibitive.

The weight and light transmission arguments are equally exaggerated.

To the environmental argument — gimme a break. Most manufacturing is bad for the environment, especially the manufacturing of smartphones. They’re packed with toxic chemicals in energy-hogging factories. To say that sapphire might be slightly less environmentally friendly than Gorilla Glass is like saying that deep-frying french fries in safflower oil contributes more to the obesity crisis than frying in canola oil. It might be technically “true,” but to say so would be a disingenuous over-focus on a someone irrelevant fact about a massive issue with vastly more relevant causes.

Tripeny’s final two points — that sapphire’s scratch resistance doesn’t keep it from breaking and that Gorilla Glass can withstand more applied pressure — is another misdirection that fails to mention the main relevant point: The relationship between scratching and breaking.

If you were to drop 100 iPhones on a linoleum floor, some roughly consistent percentage of them would break, and some percentage would not break. Let’s say that with a Gorilla Glass phone — I’m making these numbers up just for the sake of argument — 80 percent of will end up with shattered screens that need to be replaced.

The ones that break probably do so because the glass had micro-scratches on them, etched into the surface from normal wear and tear.

Drop 100 brand-new, completely un-scratched Gorilla Glass iPhones on the floor, and a smaller percentage of them would break — again, fake numbers for our mental exercise — call it 40%. Why? Because they don’t have scratches.

Back to sapphire, including sapphire laminates. These are far less likely to scratch. So after months or years of use, you could drop 100 sapphire-screen iPhones on the Linoleum floor, and their rate of breakage would be closer to brand-new Gorilla Glass phones.

The point for Apple isn’t whether any particular phone will or will not break when dropped. The point is that the total number of phones that require expensive screen replacements is lower — potentially millions lower each year, for a company like Apple.

So how do people break the glass on their iPhones? In the overwhelming majority of cases, it’s by dropping them, not applying direct, steady pressure until the screen shatters.

So Tripeny is disingenuously arguing about the superiority of Gorilla Glass in the most unlikely scenarios for breakage, while not addressing the overwhelmingly most likely case — phones that break because they’re dropped and because scratches make them prone to shattering.

All this disingenuous misdirection by Tripeny about the relative benefits and risks of Gorilla Glass and sapphire glass leads strengthens my belief that Apple is really on to something here.

So don’t fall for Corning’s baloney.

Sapphire will almost certainly bring a vast improvement to the appearance and durability of iPhone screens.

  • mahadragon

    I don’t think micro scratches on the phone surface make them more prone to scratching. I’ve never heard of that before and I doubt there’s any evidence of it. If it’s a deep scratch then yes, I think a scratch can make the screen crack more likely, but the vast majority of scratches on any smart phone are not the deep gash variety but surface scratches from normal use.

    If you drop any smart phone on the ground and it breaks it’s because you dropped it on the floor, not because it had micro-scratches on the surface.

    • LordV

      An interesting article for your reading.

      For what its worth i had an ipad 4, droped its on its corner, dented the metal frame, however the screen looked fine. About 6 months later it got dropped again, this time from a much lower height, however it hit the corner once again and sadly the glass smashed badly.

      This experience supports the article above, the most likely explanation being that small invisible fractures where caused on the first drop, which then weakened the glass for the second drop.

      I have no idea if normal use scratches could cause the same effect, however there is at least some precedence here.

    • GadgetCanada1

      Micro scratches on the phone surface make them more prone to “breaking” (not scratching as you state in your post). Any scratch makes the glass more likely to break whether deep or not. Glass with no scratches will be less likely to break than glass with scratches. It’s a simple fact.

      • Mike Retondo

        Corning has done tons of testing on broken iPhones to see why the glass cracks. What Corning has found is that micro fractures (not micro scratches) cause cracking. What they found is if you drop a phone it most likely won’t crack but it will put micro fractures in it. It’s after the second or more likely the third time you drop it that the micro fractures have weekend the glass to the point where it will crack.

      • mahadragon

        Not true, micro fractures make the phone more prone to breaking (which go deeper in the glass), not surface scratches on the glass. Micro scratches on the surface are so small they can’t affect anything.

    • Winter Charm

      As a material scientist, I can say that you’re dead wrong.

      Any flaws in a material – cracks or micro fractures – increase the likelihood of something breaking. This has been demonstrated over and over.

      Having a laminate layer on top of the glass that doesn’t scratch will improve durability significantly.

      Read this ^ The reason is that thin nano wires of glass have almost no flaws, whereas the bigger you make a piece of glass, the more flaws start to be introduced.

      Glass is really strong, but only so long as it has no flaws. Keeping glass flawless by adding sapphire laminate will be a huge help.

  • El_Prez

    The iWatch seems a more likely target for sapphire.

    • kEiThZ

      Then why buy so much?

  • Kr00

    I do believe it is a ploy, either to have other parties drop their interests in the product or to get Apple of its back so it get on with the job without scrutiny from Cupertino. My 2 cents.

  • Corning is worried as hell that they’re going to be losing Apple as a customer. Instead of working out a solution with Apple, they’re now badmouthing what Apple is doing any way they can. If Apple withdraws from being a gigantic purchaser of Gorilla Glass, Corning wants to be sure to tell the world that Apple’s execs are being complete doofuses so as to stop other companies from moving toward sapphire/glass laminates. Corning is attempting to black PR all mentions of sapphire to prevent their Gorilla Glass customers from migrating as a group away from it. They stand to lose BILLIONS of dollars, so of course they’re on a campaign to promote the slogan: “Apple and sapphire glass BAD; Gorilla Glass GOOD!”

    • Windlasher

      At least he didn’t say it was a gimmick.

    • kEiThZ

      Even worse for Corning. Gorilla glass has patents. Sapphire glass doesn’t. Any high tech glass maker could make it (although not as economically as GTAT).

  • lsills81

    Superbly written article! I almost forgot where I was :P

  • Steve Champion

    Nice use of understanding Common Fallacies and Bias to dissect an argument. Very well done!!

  • ProformaArtista

    Good slice and dice. Ha ha ha.

  • John V.

    Jesus Christ, this article felt so painful to read and so full of s**t and so long, I thought it’ll never end!

    “Here’s what Corning doesn’t want you to know about sapphire iPhones… I’m going to give you my thoughts what Tripeny isn’t telling us here, but first let’s take a quick look at Apple’s history with Gorilla Glass…”

    Woah. Shut up.

    “In fact, either Apple knows something about sapphire that corning does not, or — more likely — Corning is being disingenuous about what it knows about what Apple knows.”

    Shut. The hell. Up!

    “I’m making these numbers up just for the sake of argument”

    You jerk, you can’t make things up and have an argument about them! Didn’t you IN THE VERY SAME ARTICLE MIND YOU, say this:

    “The most common logical or argumentation fallacy in the book. In the United States, it’s called the strawman argument and in the UK, it’s called an Aunt Sally. The fallacy is to misrepresent your opponent’s claim, then argue against your own misrepresentation.”

    God, I’ll never read this site again. Unbookmarked.

    • EducatedToPerform

      Stupid post is stupid.

  • AAPL_@_$101_Is_A_Done_Deal_:)

    Those Corning dudes should just come out and said, “Apple doesn’t know what the hell they’re doing and if they don’t go with Gorilla Glass they’re just a bunch of dang fools.” It’s clear to see they must be somewhat worried to even bother to make a statement about how useless sapphire is for smartphones. Meanwhile, Corning has their sapphire plant testing out all sorts of combinations hoping that Apple and G.T. Advanced Technologies, didn’t discover some winning combination that Corning overlooked. I’m sure Apple must already realize that sapphire has those disadvantages that Corning mentioned but if they’re still going with sapphire, Corning might be facing a major butt-hurt of their pride.

    • kEiThZ

      GTAT’s secret sauce is the hyperion ion cannon that let’s them slice sapphire to 20 micrometres thin slices. That makes for some very efficient lower cost production of sapphire laminates.

  • timothytripp

    I really hope Apple doesn’t use glass laminate on the sapphire screens. I hope they just go with a much thinner screen and go pure sapphire. As Corning showed in their video it can still shatter when increasing pressure is placed on a single point, but if you just drop it, on concrete or tile (the most common breakage surfaces) will the sapphire screen develop micro-fractures the same way glass will? I don’t think so but am not sure. What I know for 100% sure is that glass WILL develop micro-fractures and we may see a rash of screens breaking under the sapphire surface. While that will keep users from cutting their fingers and keep the glass shards inside the phone, it won’t actually have the ultimately desired effect – a screen that won’t shatter OR scratch.

    • No.
      Lol, you COMPLETELY misunderstand. The sole purpose of fusing to glass is that the hardened glass is more shatter resistant, while the sapphire layer is scratch proof. Your post- to those that understand, reads something like this: “I want pure sapphire so it can’t be scratched, but is VERY likely to shatter! Derp.”

      • timothytripp

        All I mean is if the screen still shatters as badly as Gorilla Glass 3 does, whether it’s bonded or not, it won’t be good enough…

        I’m not claiming to be a glass expert, but as a 15+ year veteran in the mobile device software development profession, I’ve worked with thousands of users of every conceivable mobile device. In my opinion the biggest problem with smartphone screens is not that they scratch, that’s a minor inconvenience that can be mitigated with an InvisibleShield or similar protector, but that they shatter when dropped, rendering them unusable. Gorilla Glass – especially GG3 – is good, but nowhere near good enough. My hope was (and still is) that a screen is coming that with a sub 1mm form can be dropped multiple times onto concrete or tile with no chance of shattering. Maybe GG4 or GG5 will be it, or maybe it won’t be glass or sapphire at all, maybe a plastic or other synthetic, or maybe the answer will lie in a self-healing nano-technology.

        Then again, maybe the answer is going to lie in manufacturers making the screens easier to replace – if it’s under $50 to replace a screen (even an iPad) even GG3 could be good enough.