Gorilla Glass

Discussion in 'iPad 3 Forum' started by dustrho, Apr 29, 2012.

  1. dustrho

    dustrho
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    Does the iPad 3 have gorilla glass on it? I only ask because after using mine for one week I already have two faint scratches on mine.

    Sent from my iPad using iPF
     
  2. Krooked

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    "The iPad 2 and previous iPad both utilize Corning Gorilla Glass. This type of glass is an alkali-aluminosilicate, being primarily silica and aluminum with an alkali metal, along with other unspecified components mixed in to tweak its properties. The biggest benefit of alluminosilicate glasses, aside from being relatively tough to start with, is the fact that the rate of ion exchange is fairly high even at temperatures low enough that the structure cannot react, meaning it can be processed quickly and create deep protective layers in the glass. The iPad 2 has a modest reduction in the thickness of the glass (about 23% thinner, for those interested) compared to the first iPad, and the question of increased fracture risk has been posed. Given the identical surface quality between the two generations, the reduction of thickness should create no palpable change in toughness for the typical user. That is to say, a drop that would shatter the screen on the original iPad would likely do the same for the new model. That being said, several other design changes appear to account for the change, and might yield better performance in this department."

    It is unlikely that the Ipad 3 uses anything but Gorilla Glass 2, but may use something even tougher (?).

    For an example of this glass' strength and scratch resistance:


    Forcibly rubbing Keys and a Screw on Gorilla glass



    Strength


    All glass will scratch or break, but Gorilla Glass should withstand years of moderate to heavy use by most users.
     
    #2 Krooked, Apr 29, 2012
    Last edited by a moderator: Jun 23, 2014
  3. tritium

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    I personally don't see any value in the "gorilla" glass product. Other than not scratching - which is a basic fact of glass vs. plastic going back for decades for products like sunglasses, it collapses and shatters when an ipad is dropped - so what is the advantage here?

    Apple could have used some low-end glass and it wouldn't make a difference; if it cannot withstand the typical 2-foot drop - the way a blackberry can, for instance - why is it touted in any way (yes, I've dropped my blackberry onto concrete from about 3 feet and it did not shatter).

    And since it does break when dropped, why is it so ridiculously expensive (like $300 or so) when replacing your screen?

    It seems you get high cost, but no benefit to it.
     
  4. followthesapper

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    There is an oleophobic coating on the screen to repel fingerprints. It is likely this is what is scratched and not the glass itself.


     
  5. Seadog

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    The reason for the high replacement cost is that there are three components glued to the glass to my knowledge. The design of gorilla glass goes back over a half century, but did not have any applications until the costs were reduced and touch screens came into being. Glass can be made with a lot of different characteristics, but each has its limitations. For example, toughened (or commonly known as tempered) glass has a lot of virtues, but cannot be cut after tempering. Gorilla Glass is a modification of tempered glass as I understand it.

    In the most popular techniques, the capacitive or resistive approach, there are typically four layers:
    1. Top polyester coated with a transparent metallic conductive coating on the bottom
    2. Adhesive spacer
    3. Glass layer coated with a transparent metallic conductive coating on the top
    4. Adhesive layer on the backside of the glass for mounting.
    With the iPad, this is mounted to the digitizer.

    Screen breakage depends a lot on how it lands. I dropped my original iPad from 3 ft a long time ago. After my heart attack, I inspected it and found no damage, other than a corner chipped out of my Coveroo back cover. A different angle, a different floor material, a different possible outcome.
     
    #5 Seadog, Apr 30, 2012
    Last edited: Apr 30, 2012
  6. HKey_Current_User

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    How true! My wife dropped hers on a tile floor, from about 3.5 feet. It landed face-down, and shattered. I thought she was going to cry!
     
  7. zphone

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    I've dropped my iPhone without a case so Many times on tile floor that I am truly shocked that it has not shattered or scratched so far. However I have heard of people just having one wrong hit and it's done.

    No doubt iPad with it's much larger screen will not be as tough. I've heard shattered screens on iPads are about 9% of users over the lifetime of the device. Forget scratches, if you hit it hard enough to scratch glass chances are that it's going to shatter not scratch.

    That's why I bought the AppleCare+. with these devices a good warranty is a necessity.
     
  8. AQ_OC

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    I agree. Way too fragile to not get AppleCare+. I don't want to be worried about the device all the time.
     
  9. Lunar

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    I agree... I too am inclined to suspect it would not take much to scratch the coating, I actually managed to remove my coatng entirely on my old iPad 1, at least I think I did as it was harder to clean the finger marks off, due to stupidly using a commercial lcd cleaning liquid... supposedly safe on LCD screens, AIS I'm not certain, but strongly suspect thats what happened over time. So I advise users never to use any cleaning liquid at all.. even those that claim to be 100% safe.

    The glass on the iPad 1 was quite tough, and much thicker.. hence the weight, our iPad 1 once fell from a height of around 5ft, Silly wife had it in a shopping bag which she hung on the coat hook in a ladies toilet and it survived without a single mark even though it dropped onto a solid tiled floor, though it did have a full hefty folio case on it, and of course it was also protected somewhat by the shopping bag. I suspect the iPad 2 with it's thinner glass would not take much of a drop at all, and the iPad 3 even less. You only have to look at the design of the later case edges to realise that glass has to be very thin indeed. Personally I've always prefered the square edges of the iPad 1, they could have still made it much thinner, but retain the practical square edges, the 30way connector and headphone jack plugs would have certainly fitted better.

    When you consider the cost of the iPad 3 I think most people will be treating them with care, and yet I know 3 people, besides several on here who have managed to get scratches on the screen... and because my iPad will be doing an aweful lot of travelling away from home over the next 2 months I've relented and fitted a decent protector, whether it stays on permanently is another matter, though to be fair.. I cannot even tell it has one fitted.
     
    #9 Lunar, May 1, 2012
    Last edited by a moderator: May 1, 2012
  10. dustrho

    dustrho
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    What really bothers me is that I've been extra careful with my iPad 3, I have a smart cover on it, always make sure there's nothing on the screen before using it (ie dust), and in less than one week I have two faint scratches on my screen. I'm definitely contemplating buying the Zagg shield for the screen, but haven't pulled the trigger on it yet.

    Sent from my iPad 3 (WiFi only, 16 GB) using iPF
     

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