Dark bronze glass with improved UV and IR absorption and nitrate

Details Dark bronze glass with improved UV and IR absorption and nitrate Dark bronze glass with improved UV and IR absorption and nitrate

1999-06-16

2000-06-27

Group, Karl

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 71, 651341, 651343, 651349, C03C 3087, C03B 516

Patent

active

06080694&

ABSTRACT:
The invention is a dark bronze 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% total iron oxide as Fe.sub.2 O.sub.3 with a maximum of 1.5% Fe.sub.2 O.sub.3, wherein the redox ratio of FeO/total Fe as Fe.sub.2 O.sub.3 is less than 0.26; 0.10 to 1.00 wt. % manganese compound as MnO.sub.2 ; 0.0005 to 0.004 wt. % selenium as Se; up to 0.016 wt. % cobalt oxide as Co; the glass composition having, at 4.0 mm. thickness: 570-585 dominant wavelength, 5-30% purity of excitation, 20 to 65% light transmittance using Illuminant A (LTA), less than 35% ultra violet transmittance measured over 300-400 nm, and less than 46% infra red transmittance measured over 760-2120 nm. At 20-50% LTA, the excitation purity is 7-30%, while above 50% LTA, the excitation purity is 5-20%. This glass is particularly useful for architectural applications.

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