Glass compositions
AssigneeLibbey-Owens-Ford Co.
InventorsPaige L. Higby, Bret E. Penrod
Life of this patent
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Abstract
An infrared and ultraviolet absorbing soda-lime-silica glass of a neutral tint containing 0.3% to 0.7% by weight total iron expressed as Fe.sub.2 O.sub.3, together with amounts of Se, Co.sub.3 O.sub.4 and a ferrous iron content to provide a ratio of ferrous iron to total iron in the range of 21 to 34. NiO and TiO.sub.2 may be added to the glass. The resultant glass, in a nominal 4 mm thickness, has a visible light transmission of at least 70% and a direct solar heat transmission at least 12 percentage points below the visible light transmission. The iron in the glass is preferably provided by the inclusion of the mineral wuestite in the glass batch formulation.
Claims1
In a process for producing an IR and UV absorbing soda-lime-silica glass of a neutral tint containing oxides of iron and cobalt and having a ferrous iron to total iron (as Fe.sub.2 O.sub.3) ratio in the range of 21 to 34, including admixing, heating and melting a soda-lime-silica float glass batch mixture comprising sand, soda ash, dolomite, limestone, and a sulfate selected from the group consisting of salt cake and gypsum, the improvement comprising including in said batch wuestite as at least a partial source of the iron oxides in the resulting glass.
Dependencies are inferred from the claim text.