Libbey-owens-ford Co.

Pilkington Plc

Pilkington North America, Inc.

Rodney G Baker

Paige L Higby

Bret E Penrod

Daniel P Lubelski

Kenneth Melvin Fyles

J Joseph Cheng

Helen Louise McPhail

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 FeO, together with amounts of Se, CoOand a ferrous iron content to provide a ratio of ferrous iron to total iron in the range of 21 to 34. NiO and TiOmay 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.

Glass compositions

A neutral, generally green colored, infrared energy and ultraviolet radiation absorbing glass composition comprises conventional soda-lime-silica float glass ingredients, a relatively high concentration of moderately reduced iron, and titanium oxide(s). The resultant glass exhibits an Illuminant A visible light transmittance of at least 70%, a total solar energy transmittance not greater than about 46%, and an ultraviolet radiation transmittance not greater than approximately 38%, at selected glass thicknesses in the range of 3 mm to 5 mm. The titanium oxide(s) as well as at least a portion of the iron in the glass is provided by the inclusion of the mineral ilmenite in the glass batch formulation.

Glass production method using ilmenite

A neutral, generally green-gray low transmittance (no more than 25 luminous transmittance) soda-lime-silica glass has reduced solar energy transmittance when provided with the following colorant constituents in percent by weight:

Neutral, low transmittance glass

A soda-lime-silica glass composition containing P.sub.2 O.sub.5 for forming glass articles, the composition absorbing infrared radiation and having an Illuminant A (red end and blue end of the spectrum) transmittance of about 70 percent or more.

Infrared absorbing glass compositions

A soda-lime-silica glass composition containing TiO.sub.2 for forming glass articles, e.g., glazings, the composition absorbing both infrared and ultraviolet radiation and having an Illuminant A (red and blue end of the spectrum) transmittance of about 68 percent or more, an Illuminant C transmittance of at least about 70 percent, and a solar ultraviolet transmittance of about 50 percent.

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Maumee, OH, United States of America

Rodney G Baker