An infrared and ultraviolet radiation absorbing glass suitable for use in building and vehicle windows, which comprises, on a weight basis, 68-74% of SiO2, 0.1-3.0% of Al2O3, 8-11% of CaO, 2-4.5% of MgO, 11.5-16% of Na2O, 0.5-3.0% of K2O, 0.1-0.4% of SO3, 0.10-0.55% of total iron expressed as Fe2O3,
An infrared and ultraviolet radiation absorbing glass suitable for use in building and vehicle windows, which comprises, on a weight basis, 68-74% of SiO2, 0.1-3.0% of Al2O3, 8-11% of CaO, 2-4.5% of MgO, 11.5-16% of Na2O, 0.5-3.0% of K2O, 0.1-0.4% of SO3, 0.10-0.55% of total iron expressed as Fe2O3, 0.2-0.6% of CeO2, 15-35 ppm of CoO and 2-18 ppm of Se. In the glass the ratio of ferrous iron to ferric iron is in the range from 0.17 to 0.55. The glass has a neutral grayish tint and is well balanced in visible light transmittance, infrared radiation absorption and ultraviolet radiation absorption, and a sheet of the glass can be easily tempered by a conventional method.
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A neutral gray-colored infrared and ultraviolet radiation absorbing glass consisting essentially of, as fundamental components, on a weight basis, 68-74% of SiO2, 0.1-3.0% of Al2O3, 8-11% of CaO, 2-4.5% of MgO, 11.5-16% of Na2O, 0.5-3.0% of K2O and 0.1-0.4% of SO3, and as coloring components, on a w
A neutral gray-colored infrared and ultraviolet radiation absorbing glass consisting essentially of, as fundamental components, on a weight basis, 68-74% of SiO2, 0.1-3.0% of Al2O3, 8-11% of CaO, 2-4.5% of MgO, 11.5-16% of Na2O, 0.5-3.0% of K2O and 0.1-0.4% of SO3, and as coloring components, on a weight basis, 0.33%-0.45% of total iron expressed as Fe2O3, 0.3-0.6% of CeO2, 0.2-0.4% of TiO2, 15-30 ppm of CoO and 3-10 ppm of Se, with provisos that the weight ratio of said ferrous iron to said ferric iron, Fe2+/Fe3+, is in the range from 0.20 to 0.30, that the total of SiO2 and Al2O3 is from 68-74%, that the total of CaO and MgO is from 11-15% and that the total of Na2O and K2O is from 12-17%.
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