Blue-colored infrared and ultraviolet radiation absorbing glass and method of producing same

摘要

An infrared and ultraviolet radiation absorbing glass suitable for use in building and vehicle windows, which comprises, on a weight basis, 68.0-73.0% SiO2, 0.1-3.0% Al2O3, 7.0-11.0% CaO, 2.0-4.2% MgO, 12.0-16.0% Na2O, 0.5-3.0% K2O, 0.02-0.30% SO3, 0.30-0.90% total iron expressed as Fe2O3, 0.10-0.80% CeO2, 0-1.0% TiO2, 0-0.5% ZnO, 0-0.1% MnO and 0-0.01% CoO. In the glass the ratio of ferrous iron to ferric iron is from 0.8 to 2.5. The glass has a bluish tint and is well balanced in visible light transmittance, infrared radiation absorption and ultraviolet radiation absorption, and a sheet of the glass can easily be tempered by a conventional method. In producing this glass, it is favorable to use cullet of a frit glass in which the ratio of ferrous iron to ferric iron is from 2.0 to 5.0 as a part of a batch of glass compostion to be melted.