Patent ID: 7151065

Claim:
A grey glass comprising: a base glass portion comprising: Ingredient wt. % SiO 2 67–75% Na 2 O 10–20% CaO 5–15% MgO 0–7% Al 2 O 3 0–7% K 2 O 0–7% and a colorant portion consisting essentially of: total iron (expressed as Fe 2 O 3 ) 0.25 to 0.70% cerium oxide 0.01 to 1.0% selenium 0.00001 to 0.05% cobalt oxide 0.0001 to 0.05% titanium oxide 0 to 1.0% wherein the grey glass has a redox value (FeO/Fe 2 O 3 ) of at least 0.30, a visible transmittance (Lta) of at least 65%, a dominant wavelength in the range of from 435 nm to 570 nm, an excitation purity (Pe) of no greater than 5.0%, an IR transmittance (% IR) of no greater than 35%, a UV transmittance (% UV) of no greater than 40%, and a total solar transmittance (% TS) of no greater than 52%.