Patent ID: 6313053
Filing Date: 2001-11-06
Classification: C03C,Y10S

Abstract:
A blue colored, infrared and ultraviolet radiation absorbing glass composition having a base glass portion comprising:SiO.sub.2 about 66 to 75 percent by weightNa.sub.2 O about 10 to 20 percent by weightCaO about 5 to 15 percent by weightMgO 0 to about 5 percent by weightAl.sub.2 O.sub.3 0 to about 5 percent by weightK.sub.2 O 0 to about 5 percent by weightand a solar radiation absorbing and colorant portion consisting essentially of:total iron about 0.40 to 1.0 percent by weightCoO about 4 to 40 PPMCr.sub.2 O.sub.3 0 to about 100 PPM,the glass having a redox of greater than 0.35 up to about 0.60, a luminous transmittance of at least 55 percent, and a color characterized by a dominant wavelength of 485 to 489 nanometers and an excitation purity of about 3 to 18 percent, and wherein the glass has a total solar ultraviolet transmittance of about 60 percent or less, a total solar infrared transmittance of about 35 percent or less and a total solar energy transmittance of about 55 percent or less at a thickness of about 0.154 inches.