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: 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%.
1. 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%
erbium oxide
0.01 to 0.30%
wherein the glass has visible transmission of at least 75%, and at least one of a transmissive a* color value of −1.0 to +1.0 and a transmissive b* color value of −1.0 to +1.5, and wherein the glass comprises 0–0.0002% cerium oxide.
2. The glass 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 glass of claim 2 , wherein the glass comprises:
total iron (expressed as Fe 2 O 3 )
0.03 to 0.15%
erbium oxide
0.03 to 0.13%.
4. The glass of claim 1 , wherein the glass has a visible transmission of at least 85% at a reference thickness of about 5.6 mm.
5. The glass of claim 1 , wherein the glass has a visible transmission of at least 90% at a reference thickness of about 5.6 mm.
6. The glass of claim 1 , wherein the glass has a redox value (FeO/Fe 2 O 3 ) no greater than 0.20.
7. The glass of claim 1 , wherein the glass has a redox value (FeO/Fe 2 O 3 ) no greater than 0.15.
8. The glass of claim 1 , wherein the glass has a redox value (FeO/Fe 2 O 3 ) no greater than 0.13.
9. The glass of claim 1 , wherein the glass further comprises less than or equal to 0.020% FeO.
10. The glass of claim 1 , wherein the glass comprises from 0.0015 to 0.015% FeO.
11. The glass of claim 1 , wherein the glass comprises from 0.0015 to 0.012% FeO.
12. The glass of claim 1 , wherein the glass comprises less than or equal to 0.0002% cobalt oxide.
13. The glass of claim 1 , wherein the glass comprises less than or equal to 0.0001% cobalt oxide.
14. The glass of claim 1 , wherein the glass comprises less than or equal to 0.0001% cerium oxide.
15. 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%
erbium oxide
0.01 to 0.30%
wherein the glass has visible transmission of at least 75%, and at least one of a transmissive a* color value of −1.0 to +1.0 and a transmissive b* color value of −1.0 to +1.5, and wherein the glass comprises 0–0.12% cerium oxide.
16. 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%
erbium oxide
0.01 to 0.30%
wherein the glass has visible transmission of at least 75%, and at least one of a transmissive a* color value of −1.0 to +1.0 and a transmissive b* color value of −1.0 to +1.5, and wherein the glass is substantially free of both cerium oxide and cobalt oxide.
17. The glass of claim 1 , wherein the glass includes less than 2 ppm of Se.
18. The glass of claim 1 , wherein the glass includes less than 1 ppm of Se.
19. The glass of claim 1 , wherein the glass comprises from 0.02 to 0.13% erbium oxide.
20. The glass of claim 1 , wherein the glass has a transmissive a* color value of −1.0 to +1.0 and a transmissive b* color value of −0.7 to +1.0.
21. The glass of claim 1 , wherein the glass has a transmissive a* color value of −0.60 to +0.60 and a transmissive b* color value of −0.7 to +1.0.
22. The glass 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 .
23. The glass of claim 1 , wherein the glass comprises from 6–12% CaO and from 10–15% Na 2 O.
24. A glass comprising a base portion and a colorant portion, wherein the base portion of the glass comprises:
Ingredient
wt. %
SiO 2
67–75%
Na 2 O
10–20%
CaO
5–15%
wherein the colorant portion of the glass consists essentially of:
total iron (expressed as Fe 2 O 3 )
0.01 to 0.30%
erbium oxide
0.01 to 0.30%
wherein the glass has visible transmission of at least 75%, a transmissive a* color value of −1.0 to +1.0 and a transmissive b* color value of −1.0 to +1.5, and wherein the glass comprises 0–0.12% cerium oxide.
25. The glass of claim 24 , wherein the colorant portion consists essentially of:
total iron (expressed as Fe 2 O 3 )
0.02 to 0.20%
erbium oxide
0.02 to 0.20%.
26. The glass of claim 24 , wherein the colorant portion consists essentially of:
total iron (expressed as Fe 2 O 3 )
0.03 to 0.15%
erbium oxide
0.03 to 0.13%.
27. The glass of claim 24 , wherein the glass has a visible transmission of at least 85% at a reference thickness of about 5.6 mm.
28. The glass of claim 24 , wherein the glass has a visible transmission of at least 90% at a reference thickness of about 5.6 mm.
29. The glass of claim 24 , wherein the glass has a redox value (FeO/Fe 2 O 3 ) no greater than 0.20.
30. A high transmittance glass comprising:
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%
erbium oxide
0.01 to 0.30%
wherein the glass has visible transmission of at least 88% at a references thickness of 5.6 mm, a transmissive a* color value of −1.0 to +1.0 and a transmissive b* color value of −1.0 to +1.5, and wherein the glass comprises 0–0.12% cerium oxide.
31. The glass of claim 30 , wherein the glass comprises:
total iron (expressed as Fe 2 O 3 )
0.02 to 0.20%
erbium oxide
0.02 to 0.20%.
32. The glass of claim 30 , wherein the glass comprises:
total iron (expressed as Fe 2 O 3 )
0.03 to 0.15%
erbium oxide
0.03 to 0.13%.
33. The glass of claim 30 , wherein the glass has a visible transmission of at least 90% at a reference thickness of 5.6 mm.
34. The glass of claim 30 , wherein the glass has a visible transmission of at least 90.5% at a reference thickness of 5.6 mm.
35. The glass of claim 30 , wherein the glass has a redox value (FeO/Fe 2 O 3 ) no greater than 0.20.
36. The glass of claim 30 , wherein the glass has a redox value (FeO/Fe 2 O 3 ) of from 0.10 to 0.20.
37. The glass of claim 30 , wherein the glass is a soda-lime-silica based glass.