Medium gray colored glass with improved UV and IR absorption and

Details Medium gray colored glass with improved UV and IR absorption and Medium gray colored glass with improved UV and IR absorption and

1999-07-29

2000-03-14

Silverman, Stanley S.

Glass manufacturing

Processes

Fining or homogenizing molten glass

65 301, C03B 516, C03B 518, C03B 5225

Patent

active

060356650

ABSTRACT:
The invention is a medium color gray soda-lime-silica glass composition having excellent ultra violet and infra red absorbing ability. The colorants of the glass composition consist essentially of: greater than 0.5 but less than 0.9 wt. % total iron oxide as Fe.sub.2 O.sub.3 ; 0.1 to 1.0 wt. % manganese compound as MnO.sub.2 ; 0.0005 to 0.003 wt. % selenium as Se; 0.002 to 0.010 wt. % cobalt oxide as Co; up to 1.0 TiO.sup.2 ; the glass composition having, at 4.0 mm. thickness: 485-570 dominant wavelength, less than 5% purity of excitation, 35 to 60% light transmittance using Illuminant A, less than 40% ultra violet transmittance measured over 300-400 nm, and less than 45% infra red transmittance measured over 760-2120 nm.

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