Lightly tinted glass compatible with wood tones
AssigneePPG Industries, Inc.
InventorRobert B. Heithoff
Life of this patent
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Abstract
A clear glass, with the substantial absence of color in transmittance, and with an attractive, bright, edge coloration compatible with wood tone surroundings is achieved in a glass having greater than 85 percent, preferably greater than 87 percent, luminous transmittance by minimizing the amount of iron oxide present in the glass and including very small amounts of selenium and (optionally) cobalt oxide. Various warm, wood tone compatible colors at the edge can be attained, including a "honey" color and almost neutral grays.
Claims7
Clear glass with edge coloration compatible with wood tones comprising a soda-lime-silica base glass comprising:
- ______________________________________ Weight % ______________________________________ SiO.sub.2 66-75 Na.sub.2 O 12-20 CaO 7-12 MgO 0-5 Al.sub.2 O.sub.3 0-4 K.sub.2 O 0-3 ______________________________________
- and a colorant portion consisting essentially of:
- ______________________________________ Total iron (as Fe.sub.2 O.sub.3) Less than 0.02 Se 0.00003-0.0002 CoO 0-0.0003 ______________________________________
- whereby the glass exhibits luminous transmittance (illuminant C) of at least 85 percent at a thickness of 0.223 inches (5.66 millimeters), the colorant portion including all essential colorants in the glass.
Dependencies are inferred from the claim text.