| abstract |
It is an object of the present invention to provide a glass plate capable of effectively suppressing warping after chemical strengthening and omitting or simplifying a polishing treatment before chemical strengthening. The present invention relates to a glass plate satisfying the following formula (1): 0.07? DELTA F / DELTA H 2 O, wherein the fluorine concentration of one face opposite to the thickness direction is larger than the fluorine concentration of the other face. Here, the fluorine concentration is the average fluorine concentration (mol%) by SIMS with a depth of 1 to 24 탆. In the formula (1), ΔF is calculated from the average fluorine concentration (mol%) by SIMS at a depth of 1 to 24 μm on a surface having a large fluorine concentration, by SIMS with a fluorine concentration of 1 to 24 μm (Mol%) by the average fluorine concentration. Formula (1) of, ΔH 2 is O, a fluorine concentration of depth 1 to the depth of the surface fluoride concentration is greater from the average H 2 O concentration (mol%) by SIMS 24㎛ of 1 to 24 at the small face (Mol%) of the H 2 O concentration obtained by the SIMS of 탆. |