Gray glass composition
View Patent ↗A glass composition that includes a base glass composition including: SiO 2 from 65 to 75 weight percent, Na 2 O from 10 to 20 weight percent, CaO from 5 to 15 weight percent, MgO from 0 to 5 weight percent, Al 2 O 3 from 0 to 5 weight percent, K 2 O from 0 to 5 weight percent and BaO from 0 to 1 weight percent, and a colorant and property modifying portion including total iron from 0.5 to 0.8 weight percent, Er 2 O 3 from 0.05 to 0.5 weight percent, Se from 1 PPM to 4 PPM, and CoO from 1 PPM to 15 PPM, wherein the glass composition has a redox ratio ranging from 0.25 to 0.35.
1. A glass composition comprising a base glass composition 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
BaO
0 to 1 weight percent
and a colorant and property modifying portion consisting essentially of:
total iron
0.5 to 0.8 weight percent,
Er 2 O 3
0.05 to 0.5 weight percent,
Se
1 PPM to 4 PPM,
CoO
1 PPM to 15 PPM,
wherein the glass composition has a redox ratio ranging from 0.26 to 0.35.
2. The glass composition according to claim 1 , wherein the total iron ranges from 0.6 to 0.68 weight percent.
3. The glass composition according to claim 1 , wherein the Er 2 O 3 ranges from 0.05 to 0.4 weight percent.
4. The glass composition according to claim 1 , wherein the redox ratio ranges from 0.26 to 0.32.
5. The glass composition according to claim 1 , wherein the Se ranges from 1.5 PPM to 3 PPM.
6. The glass composition according to claim 1 , wherein the CoO ranges from 1.5 PPM to 4 PPM.
7. The glass composition according to claim 1 further comprising: Ho 2 O 3 in an amount ranging from 0 to 0.3 weight percent; Cr 2 O 3 in an amount ranging from 0 PPM to 200 PPM; and MnO 2 in an amount ranging from 0 to 0.5 weight percent.
8. A glass sheet made from the composition according to claim 1 .
9. A glass sheet according to claim 8 that exhibits the following performance properties at a thickness of 0.160 inches (4.1 mm):
a dominant wavelength ranging from 500 to 560 nanometers;
an excitation purity of less than or equal to 4 percent;
an Lta of equal to or greater than 60 percent;
a TSET less than or equal to 53 percent; and
a UV of less than or equal to 50 percent.
10. A glass sheet according to claim 9 that exhibits one or more of the following performance properties at a thickness of 0.160 inches (4.1 mm): a dominant wavelength ranging from 505 to 550 nanometers; an excitation purity of less than or equal to 3 percent; an Lta of equal to or greater than 70 percent; a TSET less than or equal to 51 percent; and a UV in the range of equal to or greater than 44 percent, and equal to or less than 50 percent.
11. A glass sheet comprising a glass composition that includes:
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,
BaO
0 to 1 weight percent, and a colorant and property
modifying portion consisting essentially of:
total iron
0.5 to 0.8 weight percent,
Er 2 O 3
0.05 to 0.5 weight percent,
Se
1 PPM to 4 PPM,
CoO
1 PPM to 15 PPM,
wherein the glass composition has redox ration ranging from 0.26 to 0.35 and wherein the glass sheet exhibits one or more of the following performance properties at a thickness of 0.160 inches (4.1 mm):
a dominant wavelength ranging from 500 to 560 nanometers;
an excitation purity of less than or equal to 4 percent; an Lta of equal to or greater than 60 percent;
a TSET less than or equal to 53 percent; and
a UV of less than or equal to 50 percent.
12. The glass sheet according to claim 11 , wherein the total iron ranges from 0.6 to 0.68 weight percent.
13. The glass sheet according to claim 11 , wherein the Er 2 O 3 ranges from 0.05 to 0.4 weight percent.
14. The glass sheet according to claim 11 , wherein the redox ratio ranges from 0.26 to 0.32.
15. The glass sheet according to claim 11 that exhibits one or more of the following performance properties at a thickness of 0.160 inches (4.1 mm):
a dominant wavelength ranging from 505 to 550 nanometers;
an excitation purity of less than or equal to 3 percent;
an Lta of equal to or greater than 65 percent;
a TSET less than or equal to 51 percent; and
a UV in the range of equal to or greater than 44 percent and equal to or less than 50 percent.
16. The glass sheet according to claim 14 wherein the UV is in the range of equal to or greater than 47 percent and equal to or less than 50 percent.
17. The glass sheet according to claim 16 wherein the Lta is equal to or greater than 70 percent.
18. The glass sheet according to claim 11 wherein the Lta is equal to or greater than 70 percent.
19. A glass sheet comprising a glass composition that includes:
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,
BaO
0 to 1 weight percent,
and a colorant and property modifying portion consisting essentially of:
total iron
0.5 to 0.8 weight percent,
Er 2 O 3
0.05 to 0.5 weight percent,
Se
1 PPM to 4 PPM,
CoO
1 PPM to 15 PPM,
Ho 2 O 3
0 to 0.3 weight percent,
Cr 2 O 3
0 PPM to 200 PPM, and
MnO 2
0 to 0.5 weight percent,
wherein the glass composition has a redox ratio ranging from 0.26 to 0.35 and wherein the glass sheet exhibits the following performance properties at a thickness of 0.160 inches (4.1 mm)
a dominant wavelength ranging from 500 to 560 nanometers;
an excitation purity of less than or equal to 4 percent;
an Lta of equal to or greater than 70 percent;
a TSET less than or equal to 53 percent; and
a UV in the range of equal to or greater than 44 percent and equal to or less than 50 percent.