How the Corning Glass 4 fares against other options!

Broken display is a nighmare for every smartphone owner. A dented body is a physical damage, but it is just at the cosmetic level. But a shattered display makes the mobile unusable. There are many plastic and tampered glass screen protectors in the market that promises to protect the display from accidental damage. But most of them hamper the touchscreen responsiveness. Fixing a shattered display could sometime cost half the price of the mobile by itself. Last year Corning Gorilla Glass 3 promised to give a scratch resistant display, but again a scratch is just a cosmetic injury. Gorilla Glass 3, though widely adopted, didn’t offer effective protection from shattered display.

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This is exactly where the new Corning Gorilla Glass 4 picks up the trail and offers to protect your mobile display from shattering on impact. Corning Gorilla Glass 4 offers protect from impact from heights upto 1 meter with 80 % success rate. Watch the video below.

Corning claims that their glass is now on over 3 million devices manufactures by more than 33 companies. But how does the new version compare to it predecessor? How does it stand up against the much stronger Sapphire crystal display? Here is what I found out after digging in a bit.

Sapphire Corning Gorilla Glass 4 Corning Gorilla Glass 3
Density 3.97 g.cm3 2.42 g/cm3 2.44 g/cm3
Young’s Modulus 345 Gpa 65.8 Gpa 71.7 Gpa
Poisson’s Ratio na 0.22 0.21
Shear Modulus 145 Gpa 26.0 Gpa 29.7 Gpa
Vicker’s Hardness (200 g Load) 2300 kgf/mm2 489 kgf/mm2 625 kgf/mm2
Fracture Toughness 2.3 Mpa m0.5 0.67 Mpa m0.5 0.7 Mpa m0.5
Compressive stress 2950 Mpa 850 Mpa 800 Mpa

Well, the technical specifications clearly implies that the Sapphire crystal when used as a display material would virtually be indestructible.¬† Sadly the Sapphire display was unable to make it to the iPhone 6 as expected. The manufactures were unable to supply to the demand. The Corning Gorilla Glass 3 was the best available option for a strong display when we compared options like DragonTrail or the ordinary soda like glass. The spec sheets implies that on the papers the Corning Gorilla Glass 3 and 4 doesn’t have major differences. But the Glass 4 can withstand higher abrasion pressure than the Glass 3.

A 0.7mm thick Glass 3 can withstand 13 psi of abration pressure, when a 0.44 mm thick Glass 4 can withstand 15 psi. This means that it can result in super thin devices. A thin device would relatively weigh less and this could also help in withstanding the drop impact. Also the Glass 4 has better compressive stress and hardness. But it is all in papers. We are not going to see Corning Gorilla Glass 4 in mobile devices, until early 2015. We will have to wait for the field results, however promising it may seem now.

 Source 1 | Source 2 | Source 3

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