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 method of making glass, the method comprising
adding iron to a glass batch at least partially in the form of melite, and melting the glass batch to form a glass having a visible transmission (Lta) no greater than 28% and an IR transmission no greater than 7%; and
wherein the glass includes a colorant portion comprising:
total iron:
0.7 to 1.8%
cobalt oxide:
0.001 to 1.0%
titanium oxide:
0.25 to 3.0%
chromium oxide:
0 to 0.010%.
2. A method of making glass, the method comprising
adding iron to a glass batch at least partially in the form of melite, and melting the glass batch to form a glass having a visible transmission (Lta) no greater than 28%; and
wherein the glass includes a colorant portion comprising:
total iron:
0.7 to 1.8%
cobalt oxide:
0.001 to 1.0%
titanium oxide:
0.25 to 3.0%
chromium oxide:
0 to 0.010%.
3. The method of claim 2 , wherein the glass has a dominant wavelength of from 450 to 530 nm, and an excitation purity (Pe) of from 10 to 25%.
4. The method of claim 3 , wherein said dominant wavelength and excitation purity are measured at a nominal thickness of the glass of anywhere from 3 mm to 4 mm.
5. The method of claim 2 , wherein the glass is substantially free of cerium.
6. The method of claim 2 , wherein the glass is substantially free of nickel.
7. The method of claim 2 , wherein the glass has a visible transmission (Lta) no greater than 25% and an JR transmission no greater than 5%.
8. The method of claim 2 , wherein the glass has a visible transmission (Lta) no greater than 20% and an JR transmission no greater than 7%.
9. A method of making glass, the method comprising
adding iron to a glass batch at least partially in the form of melite, and melting the glass batch to form a glass having a visible transmission (Lta) no greater than 28%; and
wherein the glass includes a colorant portion comprising from 0 to 0.010% chromium oxide.
10. The method of claim 9 , wherein the colorant portion comprises at least two of the following three elements:
total iron:
0.7 to 1.8%
cobalt oxide:
0.001 to 1.0%
titanium oxide:
0.25 to 3.0%.
11. The method of claim 9 , wherein the glass has a dominant wavelength of from 450 to 530 nm, and an excitation purity (Pe) of from 10 to 25%.
12. The method of claim 11 , wherein said dominant wavelength and excitation purity are measured at a nominal thickness of the glass of anywhere from 3 mm to 4 mm.
13. The method of claim 9 , wherein the glass is substantially free of cerium.
14. The method of claim 9 , wherein the glass is substantially free of nickel.
15. The method of claim 9 , wherein the glass has a visible transmission (Lta) no greater than 25% and an IR transmission no greater than 5%.
16. The method of claim 9 , wherein the glass has a visible transmission (Lta) no greater than 20% and an IR transmission no greater than 7%.