Zinc borosilicate opal glasses
AssigneeCorning Glass Works
InventorRichard M. Wiker
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Abstract
This invention is directed to the production of spontaneous opal glasses which demonstrate good microwave compatibility and dense opacity when drawn as sheet. The glasses consist essentially, analyzed in weight percent of ______________________________________ Na.sub.2 O 2.8 .+-. 0.2 ZnO 9.4 .+-. 0.6 B.sub.2 O.sub.3 12.9 .+-. 0.5 TiO.sub.2 0.8 .+-. 0.2 SiO.sub.2 Remainder ______________________________________
Claims2
A spontaneous opal glass which exhibits a coefficient of thermal expansion (0.degree.-300.degree. C.) of less than 35.times.10.sup.-7 /.degree.C., a strain point in excess of 560.degree. C., good microwave compatibility, and dense opacity when formed into sheet consisting essentially, analyzed in terms of weight percent on the oxide basis, of
- ______________________________________ Na.sub.2 O 2.8 .+-. 0.2 ZnO 9.4 .+-. 0.6 B.sub.2 O.sub.3 12.9 .+-. 0.5 TiO.sub.2 0.8 .+-. 0.2 SiO.sub.2 Remainder ______________________________________
Dependencies are inferred from the claim text.