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Infrared and ultraviolet radiation absorbing blue glass composition

  • US 5,688,727 A
  • Filed: 06/17/1996
  • Issued: 11/18/1997
  • Est. Priority Date: 06/17/1996
  • Status: Expired due to Term
First Claim
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1. A blue colored, infrared and ultraviolet radiation absorbing glass composition having a base glass portion comprising:

  • SiO2 about 66 to 75 percent by weightNa2 O about 10 to 20 percent by weightCaO about 5 to 15 percent by weightMgO 0 to about 5 percent by weightAl2 O3 0 to about 5 percent by weightK2 O 0 to about 5 percent by weightand a solar radiation absorbing and colorant portion consisting essentially of;

    total iron about 0.53 to 1.1 percent by weightCoO about 5 to 40 PPMCr2 O3 0 to about 100 PPM,the glass having a redox of about 0.25 to 0.35, a luminous transmittance of at least 55%, and a color characterized by a dominant wavelength of 485 to 489 nanometers and an excitation purity of about 3 to 18 percent.

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