According to rumors iPhone 6 will use sapphire glass as its main display. If this actually happened then it’s a bad news for Corning’s Gorilla glasses. Corning is the leader in the category of makers of smartphone display or screen. What makes sapphire glass better over gorilla glass display. The main distinguishing features between the two display materials.
Gorilla glass is a chemically toughened glass that has been made by ion-exchange process. This process is carried out by putting the sheet into 400 C tub having molten potassium salt which is responsible for an ion exchange between the larger potassium ions and smaller potassium ions which was primitively on the glass. Potassium ions provide higher protection against scratch and compressive stress.
Sapphire is also called corundum which is basically crystalline form of aluminium oxide. Corundum is a naturally occurring mineral. Generally transparent but because of impurities it can be found in different colors. If red tint is there it is ruby otherwise sapphire.
If we measure on Mohs scale Gorilla glass scores 6.8 for hardness. Sapphire is the second hardest material which naturally occurs on earth.
If we talk about the heaviness sapphire glass is only 1.5x heavier than gorilla glass. Gorilla Glass is 2.54 g/cm3 while sapphire is 3.98 g/cm3.
Currently sapphire glass has a higher production price as compared to gorilla glasses but with time as number of plants will increase the price for production will decrease. And finally the price of finished sapphire glass displays.
To set up a plant in Arizona Apple has invested $ 578 million in GT Advanced Technologies which is a lead player in sapphire glass manufacturing.