| abstract |
The present invention provides a green colored, infrared andnultraviolet absorbing glass article having a luminous transmittance of upnto 60 percent. The composition of the glass article uses a standardnsoda-lime-silica glass base composition and additionally iron, cobalt,nselenium, and chromium, and optionally titanium, as infrared andnultraviolet radiation absorbing materials and colorants. The glasses ofnthe present invention have a color characterized by a dominantnwavelength in the range of about 480 to 565 nanometers, preferablynabout 495 to 560 nanometers, with an excitation purity of no highernthan about 20 percent, preferably no higher than about 10 percent, andnmore preferably no higher than about 7 percent. The glass compositionsnmay be provided with different levels of spectral performance dependingnon the particular application and desired luminous transmittance. n In one embodiment of the invention, the glass composition of angreen colored, infrared and ultraviolet radiation absorbing soda-lime-silicanglass article includes a solar radiation absorbing and colorant portionnconsisting essentially of about 0.60 to 4 percent by weight total iron,nabout 0.13 to 0.9 percent by weight FeO, about 40 to 500 PPM CoO,nabout 5 to 70 PPM Se, about 15 to 800 PPM Cr 2 O 3 , and about 0.02 ton1 percent by weight TiO 2 . In another embodiment of the invention, thenglass composition of the article includes a solar radiation absorbing andncolorant portion consisting essentially of 1 to less than 1.4 percent bynweight total iron, about 0.2 to 0.6 percent by weight FeO, greater thann200 to about 500 PPM CoO, about 5 to 70 PPM Se, greater than 200 tonabout 800 PPM Cr 2 O 3 , and 0 to about 1 percent by weight TiO 2 . |