Ultraviolet absorbing, green tinted glass
AssigneePPG Industries, Inc.
InventorsJoseph A. Gulotta, Larry J. Shelestak
Life of this patent
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Abstract
A green tinted, ultraviolet absorbing glass is disclosed having a standard soda-lime-silica base glass composition and a colorant portion consisting essentially of: ______________________________________ CeO.sub.2 Less than 0.5 weight % Total iron Greater than 0.85 weight % (as Fe.sub.2 O.sub.3) FeO/total iron Less than 0.275. ______________________________________ The glass reduces the amount of costly cerium required to yield low ultraviolet transmittance, viz., no greater than 31 percent (300 to 390 nanometers) at a reference thickness of 3.9 millimeters.
Claims5
A green tinted, ultraviolet absorbing glass having a base glass composition consisting essentially of:
- ______________________________________ SiO.sub.2 68-75 weight % Na.sub.2 O 10-20 CaO 5-15 MgO 0-5 Al.sub.2 O.sub.3 0-5 K.sub.2 O 0-5 ______________________________________
- and a colorant portion consisting essentially of:
- ______________________________________ CeO.sub.2 Less than 0.5 weight % Total Iron Greater than 0.85 weight % (as Fe.sub.2 O.sub.3) FeO/total iron Less than 0.275 ______________________________________
- exhibiting ultraviolet transmittance no greater than 31 percent (300 to 390 nanometers) and luminous transmittance (illuminant A) of at least 70 percent, both at a reference thickness of 3.9 millimeters.
Dependencies are inferred from the claim text.