Ultraviolet absorbing glass article
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United States of America Patent
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Jan 30, 2018
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app pub date -
Apr 20, 2016
filing date -
Dec 13, 2013
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Abstract
An ultraviolet absorbing glass article comprising, as a glass matrix composition in mass % based on oxides, from 66 to 75% of SiO2, from 10 to 20% of Na2O, from 5 to 15% of CaO, from 0 to 6% of MgO, from 0 to 5% of Al2O3, from 0 to 5% of K2O, from 0.13 to 0.9% of FeO, at least 0.8% and less than 2.4% of total iron as represented by Fe2O3, and more than 1% and at most 5% of TiO2, containing from 100 to 500 mass ppm of CoO, from 0 to 70 mass ppm of Se and from 0 to 800 mass ppm of Cr2O3 in a total content of CoO, Se and Cr2O3 of less than 0.1 mass % based on the total content of components in the glass matrix composition, and having an ultraviolet transmittance of at most 2% at a thickness of 3.5 mm.
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