A scratch test (video given below) showing the durability of Gorilla Glass 5 has quickly caught the attention of Corning, and it didn’t take long for the glass manufacturer to justify why the protective layer around Samsung’s Galaxy Note 7 wasn’t able to shield it from the torture test you can see clearly below.
Before we start, we want to thank the YouTube channel JerryRigEverything and to Zack for going through the extra to perform the torture test on a Galaxy Note 7.
In the torture test, Zack uses a metal pick that possess a rating of 3 on Mohs scale. If you remember your physics lesson accurately, diamond has the highest rating on the Mohs scale, meaning that only diamond can scratch a diamond, and to improve your knowledge, our fingernails have a rating of 2.5, which means that the metal pick will easily be able to scratch it, given its hardness.
However, what’s concerning about the test is that even Gorilla Glass 4 possess a hardness of 5-6, suggesting that a metal pick should have no effect on it, and here we have a Gorilla Glass 5 that’s unable to hold its own.
According to Android Authority, Corning’s senior spokesperson, Jaymin Amin, and the company’s VP of technology, Jon Pasansky were reached in order to give a statement related to the durability of the glass. Each time a rebuttal was made to the spokesperson stating that the test was carried out well over 30 times by JerryRigEverything and that the tests lacked consistency. Here’s what the Corning spokespersons had to say:
“The test that was conducted in the video is obviously not a bonafide industry test. It’s using Mohs hardness picks but it’s in an uncontrolled manner. We also don’t know a whole lot about what loads the person has used. Whether those loads are changing as he goes through the testing. The test has been validated several times during the development process here at Corning.
The hardness pick that was used in the video was a 3, that’s considerably softer than the glass material. Oftentimes when you have a softer material like that, and depending on what kind of loads you have used, you tend to see material transfer on the test substrate.
Material transfer on the test substrate is not necessarily a scratch but it can appear to the untrained eye as a pretty visible scratch. We don’t know whether or not that is what is being seen in the video. Certainly in the testing we’ve done internally, we don’t see that issue at all with similar picks on the Mohs hardness scale.”
Meaning, Corning says that, “A Mohs pick of 3 cannot scratch glass with a hardness of 5 or 6.” as is proved many times in the internal testing of Corning. But there can be cases where it is possible when extra pressure is applied which shouldn’t be the case in day to day life. Clearly, Corning isn’t trying to point that Jerry may have rigged the results but their explation still leaves some questions.
Additionally, Pasansky, according to the source stated that the video shows metal pick pieces rubbing off the glass material and that it’s not the actual glass that’s being scratched.
“It’s a function of the difference in the hardness of the materials, but in particular the load is very important. So you could have a lower hardness pick with a much higher load and still achieve a condition that would look like a slightly higher hardness pick with a lighter load. It’s a combination of pressure and material hardness differences that exist between the pick and the material that’s being contacted.”
When asked if Gorilla Glass 5 possesses the same scratch resistant properties as Gorilla Glass 4, Corning’s answer was a bit sketchy and Kris Carlon of Android Athority concluded that Gorilla Glass 5 might not possess a higher magnitude of scratch resistance as compared to its predecessor, but it’s equal when you want to compare the two. While Gorilla Glass 5 might have been tailored to protect the display from a height of 1.6 meters, the same proportional effect cannot be said for its scratch-resistant properties.
The company’s overall tone is quite defensive, and its arguments are quite convenient. However, the truth is already out (and so is the Note7) so if Corning is biting its tongue with these arguments, the world will know sooner or later. For now, maybe use a screen protector on your Note 7 instead of going commando.
Read the full interview at Android Authority.
What do you think of Corning’s explanation? Do you think they’re making excuses?