Glass composition with low visible and IR transmission
View Patent ↗A glass having a visible transmission of no greater than 28% and low IR transmission, and employing a colorant portion: total iron (expressed as Fe 2 O 3 ): 0.7 to 1.8% cobalt oxide (e.g., Co 3 O 4 ): 0.001 to 1.0% titanium oxide (e.g., TiO 2 ): 0.25 to 3.0% selenium (e.g., Se): 0 to 0.0020% chromium oxide (e.g., Cr 2 O 3 ): 0 to 0.010%.
1. A green/grey glass comprising:
a base glass portion comprising:
Ingredient
Wt. %
SiO 2
67-75%
Na 2 O
10-20%
CaO
5-15%
MgO
0-6%
Al 2 O 3
0-5%
K 2 O
0-5%
BaO
0-1%
and a colorant portion consisting essentially of:
total iron:
0.7 to 1.8%
cobalt oxide:
0.001 to 1.0%
titanium oxide:
0.25 to 3.0%
selenium:
0 to 0.0020%
chromium oxide:
0 to 0.010%
wherein the glass is green or grey in color and at a reference thickness of 4 mm has a visible transmission (Lta) no greater than 28%, an excitation purity of from 10-25%, and an IR transmission no greater than 7%, and wherein the glass has a % FeO of at least 0.50 and a glass redox of from 0.4 to 0.75.
2. The glass of claim 1 , wherein the glass has a dominant wavelength of from 450 to 530 nm.
3. The glass of claim 2 , wherein the glass has from 0 to 0.001% chromium oxide.
4. The glass of claim 1 , wherein the glass is substantially free of cerium.
5. The glass of claim 1 , wherein the glass is substantially free of nickel.
6. The glass of claim 1 , wherein the glass has a visible transmission (Lta) no greater than 25% and an IR transmission no greater than 5%.
7. The glass of claim 1 , wherein the glass has a visible transmission (Lta) no greater than 20% and an IR transmission no greater than 5%.
8. The glass of claim 1 , wherein the colorant portion consists essentially of:
total iron:
0.9 to 1.5%
cobalt oxide:
0.01 to 0.20%
titanium oxide:
0.4 to 2.5%
selenium:
0 to 0.0010%
chromium oxide:
0 to 0.010%.
9. A green/grey glass comprising:
a base glass portion comprising:
Ingredient
Wt. %
SiO 2
67-75%
Na 2 O
10-20%
CaO
5-15%
Al 2 O 3
0-5%
K 2 O
0-5%
and a colorant portion comprising:
total iron:
0.9 to 1.5%
cobalt oxide:
0.001 to 1.0%
titanium oxide:
0.25 to 3.0%
selenium:
0 to 0.0020%
chromium oxide:
0 to 0.010%
wherein the glass is green and/or grey in color and at a reference thickness of 4 mm has a visible transmission (Lta) no greater than 28% and an IR transmission no greater than 7%, and wherein the glass has a % FeO of at least 0.50 and a glass redox of from 0.4 to 0.75.
10. The glass of claim 9 , wherein the colorant portion comprises:
total iron:
0.9 to 1.5%
cobalt oxide:
0.01 to 0.20%
titanium oxide:
0.4 to 2.5%
selenium:
0 to 0.0010%
chromium oxide:
0 to 0.010%.
11. The glass of claim 9 , wherein the glass has a dominant wavelength of from 450 to 530 nm.
12. The glass of claim 9 , wherein the glass has a visible transmission (Lta) no greater than 25% and an IR transmission no greater than 5%.
13. The glass of claim 9 , wherein the glass has an IR transmission of no greater than 5%.
14. The glass of claim 9 , wherein the glass has a visible transmission of no greater than 20%, an IR transmission of no greater than 3%, and a UV transmission of no greater than 10%.
15. The glass of claim 9 , wherein the glass has a visible transmission of no greater than 20%, an IR transmission of no greater than 5%, and a total solar (TS) transmission of no greater than 15%.
16. A green and/or grey colored glass having, at a reference thickness of 4 mm, a visible transmission of no greater than 28% and an infrared (IR) transmission of no greater than 7%, wherein the green and/or grey colored glass includes a colorant portion comprising:
Ingredient
Wt. %
total iron:
0.9 to 1.5%
cobalt oxide:
0.001 to 1.0%
titanium oxide:
0.25 to 3.0%
chromium oxide:
0 to 0.010%
wherein the glass has a % FeO of at least 0.50, and a glass redox of from 0.4 to 0.75.
17. The glass of claim 16 , wherein the glass has a dominant wavelength of from 450 to 530 nm, and an Excitation Purity (Pe) of from 6-30%.
18. The glass of claim 16 , wherein the glass is green in color.
19. The glass of claim 16 , wherein the colorant portion comprises:
total iron:
0.9 to 1.5%
cobalt oxide:
0.01 to 0.20%
titanium oxide:
0.4 to 2.5%
selenium:
0 to 0.0010%
chromium oxide:
0 to 0.010%.
20. The glass of claim 16 , wherein the glass has a visible transmission (Lta) no greater than 20%, an IR transmission of no greater than 5%, and a UV transmission no greater than 15%.
21. The glass of claim 16 , wherein the glass is substantially free of cerium and nickel.
22. The glass of claim 16 , wherein the glass is substantially free of selenium and nickel.
23. A green/grey glass comprising:
a base glass portion comprising:
Ingredient
Wt. %
SiO 2
67-75%
Na 2 O
10-20%
CaO
5-15%
Al 2 O 3
0-5%
K 2 O
0-5%
and a colorant portion comprising:
total iron:
0.7 to 1.5%
% FeO:
≧0.50%
cobalt oxide:
0.001 to 1.0%
titanium oxide:
0.25 to 3.0%
chromium oxide:
0 to 0.010%
glass redox:
0.40 to 0.75
wherein the glass is green and/or grey in color and at a reference thickness of 4 mm has a visible transmission (Lta) no greater than 28% and an IR transmission no greater than 7%.
24. The glass of claim 23 , wherein the glass is green in color and has an excitation purity (Pe) of from 10 to 25.