Chemically strengthened glass and method for producing same

A glass sheet, having a compressive stress layer formed in a surface layer thereof according to an ion exchange method,

• wherein a surface of the glass sheet has polishing flaws,
• the glass sheet has a texture direction index (Stdi) of 0.30 or more,
• a surface strength F (N) of the glass sheet measured by a ball-on-ring test is at least a value of (1400×t2), wherein t (mm) is a thickness of the glass sheet, and
• a hydrogen concentration Y in a region to a depth X from a surface of the glass sheet satisfies relational equation (I) at X=from 0.1 to 0.4 (μm):
• Y=aX+b (I)
• wherein:
• Y is the hydrogen concentration measured as H2O, (mol/L);
• X is the depth from the surface of the glass sheet (μm);
• a is −0.300 or more;
• and
• b is 0.220 or less,
• wherein the ball-on-ring test is conducted by:
• placing the glass sheet on a stainless ring whose diameter is 30 mm and whose contact part has a roundness with a curvature radius of 2.5 mm;
• applying a load on a center of the ring by the ball under a static loading condition, while a steel ball having a diameter of 10 mm is kept in contact with the glass sheet;
• and
• measuring a BOR surface strength which is a fracture load (unit:
• N) at which the glass sheet is fractured and determining an average value of twenty measured values of the BOR surface strength as the surface strength F, provided that in a case where a fracture origin of the glass sheet is apart from a loading point of the ball by 2 mm or more, the obtained value is excluded from data for calculating the average value.