| abstract |
An infrared and ultraviolet ray absorbing glass suitable for use in building and vehicle windows, which comprises, on a weight basis, 68-72% SiO 2 , 1.6-3.0% Al 2 O 3 , 8.5-11.0% CaO, 2.0-4.2% MgO, 12.0-16.0% Na 2 O, 0.5-3.0% K 2 O, 0.08-0.30% SO 3 , 0.58-0.80% total iron expressed as Fe 2 O 3 , 0.10-0.60% CeO 2 , 0.10-0.40% TiO 2 and 5-350 ppm MnO. In the glass the ratio of ferrous iron to ferric iron is from 0.3 to 0.7. The glass has a greenish tint and is well balanced in visible light transmittance, infrared radiation absorption and ultraviolet radiation absorption. The glass can easily be produced as a sheet glass by the conventional float process without significantly varying the melting and refining operation conditions, and the glass sheet can readily be tempered by a conventional method. |