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Dark gray colored glass

  • US 5,905,047 A
  • Filed: 03/20/1997
  • Issued: 05/18/1999
  • Est. Priority Date: 03/29/1996
  • Status: Expired
First Claim
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1. A dark gray colored glass comprising 100 parts by weight of a soda lime silicate glass as a matrix component and coloring components consisting essentially of from 0.8 to 1 parts by weight of total iron calculated as Fe2 O3, from 0.1 to 0.3 part by weight of FeO, from 0 to 1.0 part by weight of TiO2, from 0.0005 to 0.15 part by weight of Se, from 0.021 to 0.05 part by weight of CoO and from 0.002 to 0.05 part by weight of Cr2 O3 wherein the glass with a thickness of from 3 to 5 mm has an excitation purity of at most 7%, as measured by using illuminant Cand wherein the glass with a thickness of 5 mm has a visible light transmittance of at most 20% and a solar radiation transmittance of at most 20% as measured using illuminant A.

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