Tempered glass belongs to safety glass. The glass has good wear resistance and is very hard. the Vickers hardness of tempered glass reaches 622 to 701.
Tempered glass is actually a kind of prestressed glass. In order to improve the strength of glass, chemical or physical methods are usually used to form compressive stress on the surface of glass. so as to improve the bearing capacity, enhance the resistance of glass to wind pressure, heat and cold, impact, etc. Because the advantages tempered glass has, it is widely used for producing screen protector.
First of all, let’s take a look at the composition of tempered glass screen protector， the composition of flat tempered glass screen protector and curved screen protector can be saw below:
1. Composition of flat tempered glass screen protector: glass + AB glue + OCA
2. Composition of curved tempered glass screen protector: glass + double-sided adhesive + OCA .
In addition to the brands, the tempered glass we buy include sodium calcium glass, medium aluminum glass and high aluminum glass. Generally, sodium calcium glass is used in the low-end market, which is relatively fragile. In the middle end market, there are more aluminum glasses, and a few will use sodium calcium glass. After tempering treatment, we can bend the glass to 90 °. High aluminum glass is widely used in the high-end market. It has good flexibility and can be bent to 180 °.
Glue used in tempered screen protector:
Ab Glue is not that complicated as glass. We usually use three types of AB glue: Japanese AB glue, Korean AB glue, domestic AB glue. Generally, Korean AB glue is used more, followed by domestic AB glue in the low-end market. Due to the high cost of Japanese AB adhesive, it is rarely used by the manufacturers of tempered glass screen protector for mobile phones.
The second is the double-sided adhesive used for the curved screen tempered glass screen protector. At present, 3M double-sided adhesive is widely used, of course, some small curved surfaces will still use AB adhesive.