Low expansion USP type I amber glass
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United States of America Patent
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Nov 2, 1993
Grant Date -
N/A
app pub date -
Feb 10, 1992
filing date -
Feb 10, 1992
priority date (Note) -
Expired
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Abstract
The present invention is drawn to an amber glass composition comprising, in weight percent, about: 70-79% silicon dioxide, 2.0-3.0% aluminum oxide, 3.8-4.4% sodium oxide, 0.1-1.0% potassium oxide, 13.5-14.5% boron oxide, 4.9-7.3% manganese dioxide, and 0.2-0.9% iron oxide, and having a glass colorant system selected from iron-manganese and iron-titania.
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