Tinted borosilicate glasses
AssigneeCorning Glass Works
InventorsPaul S. Danielson, Ronald P. Mattison, Albert J. Werner
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Abstract
This invention is directed to the preparation of transparent glasses displaying a light gray-brown tint that consist essentially, in weight percent on the oxide basis, of SiO.sub.2 --80-82 B.sub.2 O.sub.3 --11.25-12 Na.sub.2 O--5.25-6 Al.sub.2 O.sub.3 --1.9-2.1 MnO.sub.2 --0.05-0.5 NiO--0.01-0.07 Cr.sub.2 O.sub.3 --0.005-0.03
Claims2
A transparent glass which, after thermal tempering, exhibits a light gray-brown color and demonstrates such chromaticity (x, y) and luminous transmittance (Y) values that x ranges between about 0.3440-0.3500, y ranges between about 0.3400-0.3525, and Y ranges between about 37-52, consists essentially, expressed in terms of weight percent on the oxide basis, of
- SiO.sub.2 --80-82
- B.sub.2 O.sub.3 --11.25-12
- Na.sub.2 O--5.25-6
- Al.sub.2 O.sub.3 --1.9-2.1
- MnO.sub.2 --0.05-0.5
- NiO--0.01-0.07
- Cr.sub.2 O.sub.3 --0.005-0.03.
Dependencies are inferred from the claim text.