Neutral grey glass compositions
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United States of America Patent
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Aug 25, 2015
Grant Date -
Nov 20, 2014
app pub date -
Mar 13, 2014
filing date -
Sep 14, 2011
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Abstract
The present invention relates to a neutral grey glass composition which has a basic composition containing the following main coloring agents: 0.40 to 0.80% of Fe2O3; 0.05 to 2.0% of TiO2; 0.2 to 2.5% of Er2O3; 20 to 200 ppm of CuO; 0.08% to 0 0.1% charcoal; and 15% to 50% of ferrous (redox), in which the glass has light transmission “A” greater than 65%, solar transmission (TS) <55%, and ultraviolet transmission <40%, having color values a*=−4 to 3 and b*=4 to −2.
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