GLASS COMPOSITION AND METHOD FOR PRODUCING GLASS ARTICLE

摘要

Disclosed is a glass composition, specifically an inorganic glass composition wherein the volume ratio of helium with a mass number of 3 to helium with a mass number of 4, namely <3>He/<4>He in the helium contained in the glass (at 0˚C, at 1 atm) is smaller than the volume ratio <3>He/<4>He in the atmosphere. Also disclosed is a method for producing a glass article comprising a step for melting a glass raw material by heating, a step for homogenizing the molten glass, a step for forming the molten glass into a desired shape, and a step for cooling the shaped glass to room temperature, wherein helium with a certain mass ratio is contained in the glass material so that a desired glass article is obtained.