Patent ID: 10399894

Abstract:
The glass sheet of the present invention is a glass sheet with a thickness of 1.6 mm or less produced by a float process in which a molten glass material is formed into a sheet on a molten metal. When one surface of the glass sheet kept in contact with the molten metal during the formation of the molten glass material into the glass sheet is defined as a first surface and the other surface of the glass sheet opposite to the first surface is defined as a second surface, at least the first surface has been subjected to a treatment for forming a densified dealkalized layer therein. An etching rate ER1 (nm/min) of the first surface and an etching rate ER2 (nm/min) of the second surface satisfy a relation of ER2/ER1≤0.8 when the first surface and the second surface are etched using 0.1 mass % hydrofluoric acid at 50° C. as an etching liquid.