Patent ID: 6995102
Filing Date: 2006-02-07
Classification: C03C,Y10S

Abstract:
1. A blue glass composition for automotive glazing comprising a soda-lime-silica base and a colorant portion, said colorant portion, consisting essentially of: 0.4 to 0.65 weight percent total iron oxide in the form of Fe greater than about 0.1 to about 0.3 weight percent manganese oxide, cobalt oxide in an amount to produce a cobalt concentration of about 0.0002 to 0.0013 weight percent, wherein the redox ratio is between about 0.43 and 0.58, said blue glass composition being characterized by between about 68 to 76 percent illuminant A transmittance, about 54 to 64 percent ultraviolet transmittance, about 12 to 22 percent infrared transmittance, a dominant wavelength between about 486 and 490 nanometers, and a purity excitation between about 7 and 11 percent, as determined at 4.0 mm thickness.