Grey glass composition
First Claim
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1. A grey glass comprising:
- a base glass portion comprising;
Ingredientwt. % SiO267-75%Na2O10-20%CaO
and a colorant portion consisting essentially of;
5-15%MgO0-7%Al2O30-7%K2O0-7%
total iron (expressed as Fe2O3)0.15 to 0.45% selenium<
wherein the grey glass has a redox value (FeO/Fe2O3) of from about 0.20 to 0.40, a visible transmission of from about 8-25%, an x color value of from 0.284 to 0.300, a y color value of from 0.300 to 0.327, and a dominant wavelength of from 435-570 nm;
=3ppmchromium oxide1-20ppmcobalt oxide130-240ppmnickel oxide500-1,000ppm titanium oxide0 to 0.20%erbium oxide0 to 1.0%
wherein a ratio of cobalt oxide/nickel oxide is from 0.22 to 0.30; and
wherein the grey glass includes one or both of;
(a) erbium oxide from 0.1 to 0.8%, and (b) titanium oxide from 0.01 to 0.10%.
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Abstract
A grey glass composition employing in its colorant portion, in certain example embodiments, iron, cobalt, nickel, and at least one of erbium and titanium. The use of erbium and/or titanium has been found to improve coloration of the grey glass, and improve tunability of the same. In certain example embodiments, the ratio of cobalt oxide to nickel oxide is from 0.22 to 0.30 in order to achieve desired coloration in certain example embodiments.
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Citations
20 Claims
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1. A grey glass comprising:
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a base glass portion comprising;
Ingredient wt. % SiO2 67-75% Na2O 10-20% CaO
5-15%MgO 0-7% Al2O3 0-7% K2O 0-7% and a colorant portion consisting essentially of;
total iron (expressed as Fe2O3) 0.15 to 0.45% selenium <
=3ppm chromium oxide 1-20 ppm cobalt oxide 130-240 ppm nickel oxide 500-1,000 ppm titanium oxide 0 to 0.20% erbium oxide 0 to 1.0% wherein the grey glass has a redox value (FeO/Fe2O3) of from about 0.20 to 0.40, a visible transmission of from about 8-25%, an x color value of from 0.284 to 0.300, a y color value of from 0.300 to 0.327, and a dominant wavelength of from 435-570 nm;
wherein a ratio of cobalt oxide/nickel oxide is from 0.22 to 0.30; and
wherein the grey glass includes one or both of;
(a) erbium oxide from 0.1 to 0.8%, and (b) titanium oxide from 0.01 to 0.10%. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A grey glass comprising:
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a base glass portion comprising;
Ingredient wt. % SiO2 67-75% Na2O 10-20% CaO
5-15%MgO 0-7% Al2O3 0-7% K2O 0-7% and a colorant portion comprising;
total iron (expressed as Fe2O3) 0.15 to 0.45% selenium <
=3ppm chromium oxide 2-12 ppm cobalt oxide 130-240 ppm nickel oxide 500-1,000 ppm titanium oxide
0 to 0.20%erbium oxide
0 to 1.0%wherein the grey glass has a visible transmission of from about 8-25%, an x color value of from 0.284 to 0.300, a y color value of from 0.300 to 0.327, and a dominant wavelength of from 435-570 nm; and
wherein the grey glass includes one or both of;
(a) erbium oxide from 0.1 to 0.8%, and (b) titanium oxide from 0.01 to 0.10%. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A grey glass comprising:
Specification