Borosilicate glass articles and method of making

Details Borosilicate glass articles and method of making Borosilicate glass articles and method of making

C - Chemistry, Metallurgy

03

C

49/77

C03C 23/00 (2006.01) C03C 3/089 (2006.01) C03C 3/091 (2006.01)

Patent

CA 1092824

ABSTRACT OF THE DISCLOSURE A method for producing a glass article which comprises melting and forming a preshaped glass article having a composition in the phase separable regions of the alkali-boro-silicate or alkali-boro-germania-silicate systems, inducing the article to phase separate, leaching out a silica-poor phase from the surface layers only to form a structure having porous surface layers surrounding a solid region of substantially the original glass com- position, washing this structure with an organic media which dis- solves oxides of boron and other leaching reaction products, drying and heating to collapse the outer porous structure to form a glass having a silica-rich surface layer surrounding a solid region having substantially the original glass composition. The method substantially reduces the breaking tendency. A glass material and preshaped glass articles are also disclosed.

286601

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