Tempered glass (Temperedglass / Reinforcedglass) is safety glass. Glass has a very good wear characteristics, and very hard, the Vickers hardness of 622-701. Tempered glass is actually a prestressed glass to increase the strength of the glass, usually a chemical or physical methods, compressive stress is formed on the glass surface, the glass surface exposed to external stress first offset, thereby increasing the bearing capacity of the reinforced glass autoantigen pressure resistance, cold and heat resistance, impact resistance and the like. The tempered glass protective film is the highest level of security for the mobile phone screen protection.