What is the third reinforcement? What are the strengthening processes for mobile phone films?

A: The strengthening of mobile phone glass is mainly achieved through chemical tempering (ion exchange). The glass is immersed in a high-temperature potassium salt solution, causing the sodium ions on the surface of the glass to be replaced by potassium ions. The volume of potassium ions increases, forming a compressive stress layer on the surface and enhancing the strength. " "One reinforcement" Refers to single ion exchange; " "Secondary reinforcement" Carry out a second treatment on the basis of the first reinforcement to further enhance the strength. " "Three enhancements" Through multi-step ion exchange and precise control, a deeper compressive stress layer is formed on the surface, resulting in superior strength and impact resistance. Difference: ① Strength: Three times strengthened > "Secondary >" Once; ② Cost: The three-step strengthening process is complex, time-consuming and costly. ③ Impact resistance: The three-time reinforced film is less likely to break. Woowhead Guanfudun is made of South Glass high alumina glass with three times of strengthening. It has passed the SGS 64g steel ball 1.2m drop ball impact test (Report No. SZIN2606001469PL02_CN), with a Mohs scale of 6 hours and a wear resistance of 10,000 reciprocating times. Ordinary films are mostly reinforced once or twice and have a wear resistance of about 3,000 times.