Green glass composition

摘要

A green glass comprises a base glass and a colourant comprising: 0.3 to 0.8 wt.% total iron as Fe2O3 wherein the ratio of FeO/total Fe as Fe2O3 is 0.35 to 0.62; 0.05 to 0.5 wt.% manganese compound as MnO2; 0 to 0.1 wt.% titanium oxide as TiO2; and 0 to 1 wt.% cerium oxide as CeO2. The coloured 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 494 to 555 nanometers with an excitation purity of 2 to 9%. The base glass may comprise 68-75% Sio2 10-18% Na2O, 5-15% CaO, 0-10% MgO 0-5% Al2O3 and 0-5% K2O.