One of the mandatory components of our smartphones is the glass, which closes the display and protects it from bumps and scratches. Glasses are different. We will try to tell if they differ from each other, and how great the difference is. If there is a difference, which glass is the safest.
Glass from the company Corning has existed since 2007. In 2012, the second-generation Gorilla Glass appeared. A year later, a third generation appeared. Today, most flagship smartphones use Gorilla Glass 5, introduced in 2016. A glass of the sixth generation was recently announced.
The process of manufacturing glass from year to year does not change much. Glass becomes stronger by being in a bath with molten salt at a temperature of 400 degrees Celsius. Potassium ions create a layer that adds strength to the glass.
It does not change year after year and scratch resistance, but the resistance to shocks and falls with each generation of Gorilla Glass grows. According to Corning, the latest generation of their glass can withstand up to 15 drops from a height of one meter. This is twice as many falls as Gorilla Glass 5.
Another popular glass is made by the Japanese manufacturer Asahi. It can be called the second most popular. There are Dragontrail, Dragontrail X and Dragontrail Pro. The latest version was released in 2016. New glass from Asahi has not been announced yet.
Tempered protective glass
There are glasses that many glue on the main glass of their smartphone. It's hard to be sure that all these glasses are made according to the same standard, but let's hope that most of them are tempered at a temperature of 600 degrees Celsius. These roasted glasses are the most accessible in the manufacture.
The least accessible are the sapphire glasses. They are made from artificially grown crystals in a barrel that is exposed to 2200 degrees Celsius. The process takes about 16-17 days. That's why sapphire glasses are so expensive. Sapphire has a hardness of 9 on the Mohs scale, while Gorilla Glass can withstand scratches from objects with a hardness no higher than 5 on the Mohs scale.
Which glass is better
The differences in scratch resistance between Corning and Asahi glass no. Sapphire crystal can be scratched only with diamond, and here it wins. Ordinary tempered glass will lose in battle.
As for flexibility and strength, the situation here is different. Sapphire crystal will soon be scattered than bent. Gorilla Glass is much more flexible. This means that the glass is capable of withstanding a stronger pressure. Corning assures that the sapphire glass will not be able to withstand a weight of 73 kilos, while their decision is held at 195 kilograms. The Dragontrail glasses overtake Corning and bypass sapphire glasses. Tempered protective glass can not even be considered.
And it turns out that we have to choose between greater resistance to scratches and greater tolerance for shocks. Manufacturers today choose a lower cost, and install the glasses from Corning and Asahi. Sapphire glasses are not used in all products, and they are not necessarily used to protect the screen, but many consumers would not refuse to have a smartphone whose screen is not scratched. True, smartphone users found their way out. They buy smartphones with Gorilla Glass and glue it with a hot protective glass.