Blue-green grass
View Patent ↗A blue-green colored glass composition includes a base portion, such as a conventional soda-lime-silica base, and major colorants. In one embodiment, the major colorants include 0.7 to 0.9 weight percent total iron (Fe 2 O 3 ), 0.2 to 0.3 weight percent FeO, and 0 to 5 ppm CoO. The glass is characterized by a dominant wavelength in the range of 490 nm to 495 nm and an excitation purity in the range of 3% to 11%. The glass of the invention can be essentially free of Se.
1. A blue-green colored glass composition, comprising:
a base portion comprising:
SiO 2
65 to 75
weight percent,
Na 2 O
10 to 20
weight percent,
CaO
5 to 15
weight percent,
MgO
0 to 5
weight percent,
Al 2 O 3
0 to 5
weight percent,
K 2 O
0 to 5
weight percent, and
major colorants comprising:
Fe 2 O 3 (total iron)
0.7 to 0.9
weight percent,
FeO
0.2 to 0.3
weight percent, and
CoO
1 to 5
ppm, and
TiO 2
0.1 to 2.0
weight percent,
wherein the glass is characterized by a dominant wavelength in the range of 490 nm to 495 nm, an excitation purity in the range of 7.5% to 10% and an ISOV value greater than 30 percent at a thickness of 0.129 inch.
2. The glass composition of claim 1 , wherein the glass is essentially free of Se.
3. The glass composition of claim 1 , wherein the total iron is in the range of 0.7 weight percent to 0.85 weight percent.
4. The glass composition of claim 1 , wherein the total iron is in the range of 0.73 weight percent to 0.81 weight percent.
5. The glass composition of claim 1 , wherein the FeO is in the range of 0.21 wt. % to 0.3 wt. %.
6. The glass composition of claim 1 , wherein the FeO is in the range of 0.23 wt. % to 0.28 wt. %.
7. The glass composition of claim 1 , wherein the dominant wavelength is in the range of 490 nm to 493 nm.
8. The glass composition of claim 1 , further comprising Se less than or equal to 2 ppm.
9. The glass composition of claim 8 , wherein Se less than or equal to 1 ppm.
10. The glass of composition claim 1 , further comprising less than 200 ppm Cr 2 O 3 .
11. The glass composition of claim 1 , further comprising Cr 2 O 3 in the range of 20 ppm to 100 ppm.
12. The glass composition of claim 1 , further comprising Cr 2 O 3 in the range of 20 ppm to 50 ppm.
13. The glass composition of claim 1 , wherein TiO 2 is in the range of 0.1 weight percent to 1.5 weight percent.
14. The glass composition of claim 13 , wherein TiO 2 is in the range of 0.2 weight percent to 1 weight percent.
15. The glass composition of claim 1 , further comprising SO 3 less than or equal to 0.18 weight percent.
16. The glass composition of claim 1 , wherein the glass has a visible light transmittance in the range of 64 percent to 69 percent at a thickness of 0.223 inch.
17. The glass composition of claim 1 , wherein the glass has a visible light transmittance in the range of 64 percent to 68 percent at a thickness of 0.223 inch.
18. The glass composition of claim 1 , wherein the glass has a TSET in the range of 30 percent to 40 percent at a thickness of 0.223 inch.
19. The glass composition of claim 1 , wherein the glass has a TSET in the range of 33 percent to 37 percent at a thickness of 0.223 inch.
20. The glass composition of claim 1 , wherein the glass has a shading coefficient in the range of 0.5 to 0.7 at a thickness of 0.223 inch.
21. The glass composition of claim 1 , wherein the glass has a shading coefficient in the range of 0.57 to 0.6 at a thickness of 0.223 inch.
22. The glass composition of claim 1 , wherein the glass has an ISOUV value in the range of 18 percent to 25 percent at a thickness of 0.223 inch.
23. The glass composition of claim 1 , wherein the glass has an ISOUV value in the range of 19 percent to 21 percent at a thickness of 0.223 inch.
24. The glass composition of claim 1 , wherein the glass has a redox ratio in the range of 0.2 to 0.4.
25. The glass composition of claim 1 , wherein the glass has a redox ratio in the range of 0.29 to 0.37.
26. The glass composition of claim 14 , wherein the glass has a first side and a second side, and the second side has tin or oxides of tin embedded therein.
27. A float glass made from the composition of claim 14 .
28. A blue-green colored glass composition, comprising:
a base portion comprising:
SiO 2
65 to 75
weight percent,
Na 2 O
10 to 20
weight percent,
CaO
5 to 15
weight percent,
MgO
0 to 5
weight percent,
Al 2 O 3
0 to 5
weight percent, and
K 2 O
0 to 5
weight percent, and
a colorants consisting essentially of:
Fe 2 O 3 (total iron)
0.7 to 0.9
weight percent,
FeO
0.2 to 0.3
weight percent,
CoO
0 to 5
ppm, and
TiO 2
0 to 2.0
weight percent,
wherein the glass is characterized by a dominant wavelength in the range of 490 nm to 495 nm, an excitation purity in the range of 3% to 11%, and an ISOUV value greater than 25 percent at a thickness of 0.129 inch.