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 0 to 1 weight percent, and a colorant and property modifying portion including total iron from 0.25 to 0.9 weight percent, Cr 2 O 3 from 6 PPM to 400 PPM, Er 2 O 3 from 0.3 to 3.0 weight percent, and TiO 2 from 0.1 to 0.8 weight percent, wherein the glass composition has a redox ratio ranging from 0.15 to 0.62.
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 comprising:
total iron
0.25 to 0.9 weight percent,
Cr 2 O 3
6 PPM to 400 PPM,
Er 2 O 3
0.3 to 3.0 weight percent,
TiO 2
0.1 to 0.8 weight percent,
wherein the glass composition has a redox ratio in the range from 0.15 to 0.62 and the weight percent of the ingredients of the colorant and property modifying portion are selected to provide a glass piece that exhibits an Lta of equal to or greater than 60 percent at a thickness of 0.1535 inches (3.9 mm).
2. The glass composition according to claim 1 , wherein the total iron ranges from 0.3 to 0.8 weight percent.
3. The glass composition according to claim 1 wherein the Cr 2 O 3 ranges from 10 PPM to 300 PPM.
4. The glass composition according to claim 1 , wherein the Er 2 O 3 ranges from 0.4 weight percent to 2.1 weight percent.
5. The glass composition according to claim 1 wherein the TiO 2 ranges from 0.15 weight percent to 0.6 weight percent.
6. The glass composition according to claim 1 wherein the Er 2 O 3 ranges from 1.0 weight percent to 2.0 weight percent.
7. The glass composition according to claim 1 wherein the redox ratio ranges from 0.25 to 0.55.
8. The glass composition according to claim 1 further comprising
CoO in an amount greater than 0 PPM to 15 PPM;
Nd 2 O 3 in amount greater than 0 to 1.0 weight percent;
CuO in an amount greater than 0 to 0.5 weight percent;
MnO 2 in an amount greater than 0 to 0.75 weight percent;
CeO 2 in an amount greater than 0 to 1.0 weight percent;
V 2 O 5 in an amount greater than 0 to 0.3 weight percent; and
NiO in an amount greater than 0 to 150 PPM.
9. A glass sheet made from the composition according to claim 1 .
10. A glass sheet made from a class 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 comprising:
total iron
0.25 to 0.9 weight percent,
Cr 2 O 3
6 PPM to 400 PPM,
Er 2 O 3
0.3 to 3.0 weight percent,
TiO 2
0.1 to 0.8 weight percent,
wherein the glass composition has a redox ratio in the range from 0.15 to 0.62, and the glass sheet exhibits one or more of the following performance properties at a thickness of 0.1535 inches (3.9 mm):
a dominant wavelength ranging from 475 to 541 nanometers;
an excitation purity of less than or equal to 5 percent;
an Lta of equal to or greater than 60 percent;
a TSET less than or equal to 60 percent; and
a SAE UV of less than or equal to 49 percent.
11. A glass sheet according to claim 10 that exhibits one or more of the following performance properties at a thickness of 0.1535 inches (3.9 mm):
a dominant wavelength ranging from 485 to 533 nanometers;
an excitation purity of less than or equal to 4 percent;
an Lta of equal to or greater than 65 percent;
a TSET less than or equal to or less than 57 percent; and
a SAE UV of less than or equal to or less than 47 percent.
12. A laminated article made from at least one glass sheet according to claim 10 .
13. 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, and
BaO
0 to 1
weight percent,
and a colorant and property modifying portion comprising:
total iron
0.25 to 0.9 weight percent,
Cr 2 O 3
6 PPM to 400 PPM,
Er 2 O 3
0.3 to 3.0 weight percent,
TiO 2
0.1 to 0.8 weight percent,
wherein the glass composition has a redox ratio ranging from 0.15 to 0.62 and wherein the glass sheet exhibits one or more of the following performance properties at a thickness of 0.1535 inches (3.9 mm):
a dominant wavelength ranging from 475 to 541 nanometers; an excitation purity of less than or equal to 5 percent;
an Lta of equal to or greater than 60 percent; a TSET less than or equal to 60 percent; and a SAE UV of less than or equal to 49 percent.
14. The glass sheet according to claim 13 , wherein the total iron ranges from 0.3 to 0.8 weight percent.
15. The glass sheet according to claim 13 , wherein the Cr 2 O 3 ranges from 10 PPM to 300 PPM.
16. The glass sheet according to claim 13 , wherein the Er 2 O 3 ranges from 0.4 weight percent to 2.1 weight percent.
17. The glass sheet according to claim 13 , wherein the TiO 2 ranges from 0.15 weight percent to 0.6 weight percent.
18. The glass sheet according to claim 13 , wherein the Er 2 O 3 ranges from 1.0 weight percent to 2.0 weight percent.
19. The glass sheet according to claim 13 , wherein the redox ratio ranges from 0.25 to 0.55.
20. The glass sheet according to claim 13 further comprising
CoO in an amount greater than 0 PPM to 15 PPM;
Nd 2 O 3 in amount greater than 0 to 1.0 weight percent;
CuO in an amount greater than 0 to 0.5 weight percent;
MnO 2 in an amount greater than 0 to 0.75 weight percent;
CeO 2 in an amount greater than 0 to 1.0 weight percent;
V 2 O 5 in an amount greater than 0 to 0.3 weight percent; and
NiO in an amount greater than 0 to 150 PPM.