NITRATE/NITRITE-FREE MANUFACTURING OF GLASS WITH SELENIUM

摘要

The invention is a method of retaining selenium in a glass containing selenium by including a manganese compound but excluding nitrates or nitrites routinely used in the industry to retain selenium. Particularly, a preferred embodiment involves manufacturing a grey soda-lime-silica glass composition including selenium as a colorant, the components of the grey soda-lime-silica glass have colorants consisting essentially of: greater than 0.9 to 1.9 wt.% total iron oxide as Fe2O3; 0.10 to 1.00 wt.% manganese compound as MnO2; 0.0010 to 0.0060 wt.% selenium as Se; 0.002 to 0.025 wt.% cobalt oxide as Co, and 0 to 1.0 wt.% titanium oxide as TiO2 which are combined and melted to make the glass composition. The glass composition has at 4.0 mm. thickness: 10 to 55 % light transmittance using Illuminant A, less than 25 % ultra violet transmittance, and less than 50 % infrared transmittance.