| 摘要 |
<p> The present invention pertains to a glass plate in which the fluorine concentration at one of surfaces facing in the thickness direction is greater than the fluorine concentration at the other surface, wherein the glass plate has a surface layer fluorine proportion, represented by the following formula (I), of from 0.5 to 0.95, inclusive. Surface layer fluorine proportion = F0-3/F0-30…(I). In formula (I), F0-3 is calculated from the following formula (II). F0-3=[average fluorine concentration (mol%) at a depth of 0-3μm at the surface of high fluorine concentration, determined by secondary ion mass spectroscopy (SIMS)] × 3…(II). In formula (I), F0-30 is calculated from the following formula (III). F0-3=[average fluorine concentration (mol%) at a depth of 0-30μm at the surface of high fluorine concentration, determined by SIMS] × 30…(III).</p> |
