# US 2014/0150525 A1 · Method for impact-testing chemically strengthened glass, method for reproducing cracks in chemically strenghtned glass, and method for manufacturing chemically strengthened glass > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0150525 A1 - Document ID: US20140150525A1 - Status: Published application - Kind: A1 - Application number: 14/172,061 - Filed: 2014-02-04 - Published: 2014-06-05 - Earliest claimed: 2011-08-04 - Assignees: Asahi Glass Company, Limited - Applicants: Asahi Glass Company, Limited - Inventors: Hiroyuki Okawa; Kazuhiko Yamanaka - Web page: https://patentgrep.com/patent/US20140150525A1 ## CPC - G01N 3/303: generated only by free-falling weight - G01M 7/08: Shock-testing - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) - G01M: TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR ## Abstract A chemically strengthened glass is disposed on a base, and an impacting object is dropped from above in a state where one surface of the chemically strengthened glass is in contact with an abrasive surface of a sandpaper containing an abrasive having a size of not smaller than a depth of a compressive stress layer. ## Claims ### Claim 1 A method for impact-testing a chemically strengthened glass having formed on a surface thereof a compressive stress layer, the method comprising disposing the chemically strengthened glass on a base, and dropping an impacting object from above in a state where one surface of the chemically strengthened glass is in contact with an abrasive surface of a sandpaper containing an abrasive having a size of not smaller than a depth of the compressive stress layer. ### Claim 2 (depends on 1) The method for impact-testing a chemically strengthened glass according to claim 1, wherein the sandpaper is disposed on the upper side of the chemically strengthened glass. ### Claim 3 (depends on 1) The method for impact-testing a chemically strengthened glass according to claim 1, wherein an anti-scattering film is placed on another surface of the chemically strengthened glass, the another surface being not in contact with the abrasive surface of the sandpaper. ### Claim 4 (depends on 2) The method for impact-testing a chemically strengthened glass according to claim 2, wherein an anti-scattering film is placed on another surface of the chemically strengthened glass, the another surface being not in contact with the abrasive surface of the sandpaper. ### Claim 5 A method for reproducing a crack in a chemically strengthened glass having formed on a surface thereof a compressive stress layer, the method comprising giving an impact on the chemically strengthened glass to thereby make a flaw having a depth larger than the compressive stress layer. ### Claim 6 (depends on 5) The method for reproducing a crack in a chemically strengthened glass according to claim 5, wherein the chemically strengthened glass is disposed on a base and an impacting object is dropped from above in a state where one surface of the chemically strengthened glass is in contact with an abrasive surface of a sandpaper containing an abrasive having a size of not smaller than a depth of the compressive stress layer. ### Claim 7 (depends on 6) The method for reproducing a crack in a chemically strengthened glass according to claim 6, wherein the sandpaper is disposed on the upper side of the chemically strengthened glass. ### Claim 8 (depends on 6) The method for reproducing a crack in a chemically strengthened glass according to claim 6, wherein an anti-scattering film is placed on another surface of the chemically strengthened glass, the another surface being not in contact with the abrasive surface of the sandpaper. ### Claim 9 (depends on 7) The method for reproducing a crack in a chemically strengthened glass according to claim 7, wherein an anti-scattering film is placed on another surface of the chemically strengthened glass, the another surface being not in contact with the abrasive surface of the sandpaper. ### Claim 10 (depends on 5) The method for reproducing a crack in a chemically strengthened glass according to claim 5, wherein an impacting object which has a tapered tip with a length not smaller than a depth of the compressive stress layer and has a hardness higher than that of the chemical strengthened glass is made to collide with one surface of the chemically strengthened glass. ### Claim 11 (depends on 10) The method for reproducing a crack in a chemically strengthened glass according to claim 10, wherein an anti-scattering film is placed on another surface of the chemically strengthened glass, with which the impacting object is not made to collide. ### Claim 12 (depends on 1) A method for manufacturing a chemically strengthened glass having formed on a surface thereof a compressive stress layer, the method comprising: determining a threshold value by the method for impact-testing a chemically strengthened glass sheet as described in claim 1 by changing a drop height of a sphere, and performing a sampling inspection of judging a quality of the chemically strengthened glass based on the threshold value. ### Claim 13 (depends on 2) A method for manufacturing a chemically strengthened glass having formed on a surface thereof a compressive stress layer, the method comprising: determining a threshold value by the method for impact-testing a chemically strengthened glass sheet as described in claim 2 by changing a drop height of a sphere, and performing a sampling inspection of judging a quality of the chemically strengthened glass based on the threshold value. ### Claim 14 (depends on 3) A method for manufacturing a chemically strengthened glass having formed on a surface thereof a compressive stress layer, the method comprising: determining a threshold value by the method for impact-testing a chemically strengthened glass sheet as described in claim 3 by changing a drop height of a sphere, and performing a sampling inspection of judging a quality of the chemically strengthened glass based on the threshold value. ### Claim 15 (depends on 4) A method for manufacturing a chemically strengthened glass having formed on a surface thereof a compressive stress layer, the method comprising: determining a threshold value by the method for impact-testing a chemically strengthened glass sheet as described in claim 4 by changing a drop height of a sphere, and performing a sampling inspection of judging a quality of the chemically strengthened glass based on the threshold value.