| 摘要 |
PROBLEM TO BE SOLVED: To obtain glass having high mechanical strength by achieving both of ion exchange performance and devitrification resistance of the glass.SOLUTION: A tempered glass substrate having a compression stress layer on the surface thereof, has a glass composition comprising, by mass%, 40 to 71% SiO, 3 to 21% AlO, 0 to 3.5% LiO, 7 to 20% NaO, and 0 to 15% KO and is cut after tempering treatment. |
