| 摘要 |
PROBLEM TO BE SOLVED: To provide chemically-strengthened glass which keeps a constant record, when a dynamic indenter impact test is applied thereto under constant conditions, and which is hardly cracked, and to provide a production method of the chemically-strengthened glass.SOLUTION: The chemically-strengthened glass is defined by such a dynamic indenter impact test method that an impact member, which has a tungsten carbide indenter of a quadrangular pyramid at the apex for making an impact on the glass, is dropped thereon in the vertical direction. When the impact member having 120 g mass is used, the angle α of the apex thereof is 140° and the dynamic indenter impact test method is applied thereto, the 100% destruction height Hsatisfies H≥50 mm and when the impact member having 120 g mass is used, the angle α of the apex thereof is 120° and the dynamic indenter impact test method is applied thereto, the 100% destruction height Hsatisfies H≥5 mm. On condition that the indenter having the angle α at the apex is dropped from the same height and the chemically-strengthened glass is broken four times, the 100% destruction height His the minimum height. |
