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, the glass may include a base glass (e.g., soda lime silica base glass) and, in addition, by weight percentage, from 0.01 to 0.30% total iron (expressed as Fe 2 O 3 ). The glass may be made using a batch redox of at least +7.5.
1. A method of making a glass comprising:
Ingredient
wt. %
SiO 2
67-75%
Na 2 O
10-20%
CaO
5-15%
total iron (expressed as Fe 2 O 3 )
0.01 to 0.30%
wherein the glass has visible transmission of at least 90%, a transmissive a* color value of −1.5 to +1.0, and a transmissive b* color value of −1.0 to +1.5, wherein the method comprises:
utilizing a batch redox of from +7.5 to +14 when making said glass.
2. The method of claim 1 , wherein the glass comprises:
total iron (expressed as Fe 2 O 3 )
0.02 to 0.20%
erbium oxide
0.02 to 0.20%.
3. The method of claim 1 , wherein the batch redox utilized in making the glass is from +8 to +12.
4. The method of claim 1 , wherein the batch redox utilized in making the glass is from +8.5 to +11.
5. The method of claim 1 , wherein the batch redox utilized in making the glass is from +9 to +11.
6. The method of claim 1 , wherein the glass comprises:
total iron (expressed as Fe 2 O 3 ):
0.01-0.30%
% FeO:
0.001-0.10%
glass redox:
<=0.25
erbium oxide:
0-0.30%
cerium oxide:
0-0.30%
cobalt oxide:
0-0.001%.
7. The method of claim 1 , wherein the glass comprises:
total iron (expressed as Fe 2 O 3 ):
0.02-0.20%
% FeO:
0.002-0.05%
glass redox:
<=0.20
erbium oxide:
0.02-0.20%
cerium oxide:
0-0.18%
cobalt oxide:
0-0.0005%.
8. The method of claim 1 , wherein the glass comprises:
total iron (expressed as Fe 2 O 3 ):
0.03-0.08%
% FeO:
0.004-0.015%
glass redox:
<=0.20
erbium oxide:
0.03-0.13%.
9. The method of claim 1 , wherein the glass has a redox value (FeO/Fe 2 O 3 ) no greater than 0.16.
10. The method of claim 1 , wherein the glass further comprises from 0.001 to 0.10% FeO.
11. The method of claim 1 , wherein the glass comprises from 0.002 to 0.05% FeO.
12. The method of claim 1 , wherein the glass comprises from 0.004 to 0.015% FeO.
13. The method of claim 1 , wherein the glass comprises less than or equal to 0.0002% cobalt oxide.
14. The method of claim 1 , wherein the glass comprises less than or equal to 0.0001% cobalt oxide.
15. The method of claim 1 , wherein the glass comprises less than or equal to 0.0002% cerium oxide.
16. The method of claim 1 , wherein the glass comprises less than or equal to 0.0001% cerium oxide.
17. The method of claim 1 , wherein the glass has a transmissive a* color value of −1.0 to +1.0.
18. The method of claim 1 , wherein the glass has a transmissive a* color value of −0.8 to +0.5 and a transmissive b* color value of −0.7 to +1.0.
19. The method of claim 1 , wherein the glass comprises from 0-5% MgO, from 0-5% K 2 O and from 0-5% Al 2 O 3 .
20. The method of claim 1 , wherein the glass includes a colorant portion which consists essentially of:
total iron (expressed as Fe 2 O 3 ):
0.01-0.30%
erbium oxide:
0-0.30%
cerium oxide:
0-0.30%
cobalt oxide:
0-0.0005%.
21. The method of claim 1 , wherein the glass includes a colorant portion which consists essentially of total iron (expressed as Fe 2 O 3 ) in an amount of from 0.01 to 0.30%.
22. A method of making soda-lime-silica based glass, the method comprising utilizing a batch redox of at least +7.5 when making the glass, wherein the glass has a visible transmission of at least 75%.
23. The method of claim 22 , wherein the glass comprises:
SiO 2
67-75%
Na 2 O
10-20%
CaO
5-15%
total iron (expressed as Fe 2 O 3 )
0.01 to 0.30%
and wherein the glass has visible transmission of at least 80%, and a transmissive a* color value of −1.5 to +1.0.
24. The method of claim 23 , wherein the glass has a visible transmission of at least 85%, and a transmissive a* value of −1.0 to +1.0.
25. The method of claim 22 , wherein the glass has a glass redox value of no greater than 0.20.
26. The method of claim 22 , wherein the batch redox utilized in making the glass is from +8 to +12.