Clear glass composition
View Patent ↗Glass is provided so as to have high visible transmission and/or fairly clear or neutral color. In certain example embodiments of making glass according to examples of the invention, the glass batch may include a base glass (e.g., soda lime silica base glass) and, in addition, by weight percentage: total iron (expressed as Fe 2 O 3 ): 0.01 to 0.30% erbium oxide (e.g., Er 2 O 3 ): 0.01 to 0.30% cerium oxide (e.g., CeO 2 ): 0.005 to 0.30%. Optionally, neodymium oxide (e.g., Nd 2 O 3 ) may also be provided in the glass in certain example embodiments. In other embodiments, the cerium oxide may be replaced with or supplemented by NaNO 3 or some other nitrate(s) as an oxidizer.
1. Glass comprising:
Ingredient
wt. %
a base glass portion comprising:
SiO 2
67–75%
Na 2 O
10–20%
CaO
5–15%
a colorant portion comprising:
total iron (expressed as Fe 2 O 3 )
0.054 to 0.30%
erbium oxide
0.01 to 0.30%
cerium oxide
0 to 0.30%
wherein the glass has visible transmission of at least 80%, a transmissive a* color value of −1.0 to +1.0, and a transmissive b* color value of −1.0 to +1.5.
2. The glass of claim 1 , wherein the glass has a redox value (FeO/Fe 2 O 3 ) of less than or equal to 0.20.
3. The glass of claim 1 , wherein the glass has a redox value (FeO/Fe 2 O 3 ) of less than or equal to 0.15.
4. The glass of claim 1 , wherein the glass has a redox value (FeO/Fe 2 O 3 ) of less than or equal to 0.13.
5. The glass of claim 1 , wherein the glass comprises from 0.02 to 0.20% erbium oxide.
6. The glass of claim 5 , wherein the glass comprises from 0.03 to 0.13% erbium oxide.
7. The glass of claim 1 , wherein the glass has a visible transmission of at least 85%.
8. The glass of claim 1 , wherein the glass has a visible transmission of at least 90%.
9. The glass of claim 1 , wherein the glass comprises less than or equal to 0.020% FeO.
10. The glass of claim 1 , wherein the glass comprises less than or equal to 0.011% FeO.
11. The glass of claim 1 , wherein the glass comprises from 0.01 to 0.18% cerium oxide.
12. The glass of claim 1 , wherein the glass comprises from about 10–15% Na 2 O and from about 6–12% CaO.