The composition of the mobile phone glass is not much different from that of ordinary glass, except that the content of the glass silica of the mobile phone is higher and the melting temperature is higher. The biggest difference between them is the post-processing process.
After the ordinary glass is melted, it can be annealed (the thickness can be 2 mm or less without annealing), otherwise it is easy to burst.
After the mobile phone glass is melted, it will not anneal and will not burst because it is very thin. However, in order to achieve high strength, it is processed through a tempering process. The ultra-thin cell phone glass tempering process is difficult because the film is too thin and it is difficult to generate strong stress, so the process is special. In addition to physical tempering, a few high-end mobile phone glass will be chemically tempered to achieve high strength.
In addition, in order to improve the hardness and scratch resistance of the mobile phone glass, the high-end mobile phone glass will be coated on the surface, such as a layer of aluminum oxide (Al2O3), the Mohs hardness can reach 9. (Al2O3 is the main component of red sapphire.) So it is also called sapphire glass.
Other coatings, such as oil resistant coatings, conductive coatings, etc., are independent of the glass itself and are related to the needs of the phone.