Patent ID: 8324124
Filing Date: 2012-12-04
Classification: C03B,C03C,H01J

Abstract:
1. A process for producing a glass substrate, which comprises forming molten glass obtained by melting raw materials into a glass ribbon in a float bath, annealing the glass ribbon by a cooling apparatus and cutting the glass ribbon to form the glass substrate, wherein a hydrogen concentration in an atmosphere of the float bath exceeds 3%, and a glass retention time in the float bath is from 4 to 15 minutes, wherein the glass substrate has a composition comprising, as represented by mass percentage based on oxides, where the composition has a specific gravity of at most 2.7, an average thermal expansion coefficient from 50 to 350° C. of from 80×10 wherein when a viscosity is η, the temperature at which log η=2 is satisfied is at most 1,550° C., and a yellow coloring b* on a surface of the glass is at most 8 after a silver paste is applied on the glass surface, followed by firing, and then the silver paste is removed.