Amber-free reduced blue glass composition

Year	Description
2001	Invention patented by Edward Nashed Boulos and James Victor Jones on October 25th, 2001. Abstract: The present invention is a blue soda-lime-silica glass composition. The composition comprises 68 to 75% SiO.sub.2, 10 to 18% Na.sub.2 O, 5 to 15% CaO, 0 to 10% MgO, 0 to 5% Al.sub.2 O.sub.3, and 0 to 5% K.sub.2 O, where CaO+MgO is 6 to 15% and Na.sub.2 O+K.sub.2 O is 10 to 20%, and colorants comprising: 0.3 to 0.8 wt. % total iron oxide as Fe.sub.2 O.sub.3 wherein the ratio of FeO/total Fe as Fe.sub.2 O.sub.3 is 0.35 to 0.62; 0.05 to 0.5 wt. % manganese compound as MnO.sub.2, 0 to 0.30 wt. % titanium oxide as TiO.sub.2 ; and 0 to 0.8 wt. % cerium oxide as CeO.sub.2. The colored glass has the following spectral properties at 4.0 mm. thickness: 65 to 81% light transmittance using Illuminant A (LTA) and using Illuminant C has a dominant wavelength of 488 to 494 nanometers with an excitation purity of 4 to 11%.
Source: selected by the editor from original sources.

Invention: Amber-free reduced blue glass composition