| abstract |
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. |