Green 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 a colorant and property modifying portion including total iron ranging from of equal to or less than 0.6 weight percent; and TiO 2 ranging from 0.1 to 1.0 weight percent, wherein the redox ratio ranges from 0.33 to 0.45 and the weight percents are based on the total weight of the composition.
1. A glass sheet 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, and
K 2 O
0 to 5 weight percent;
a colorant and property modifying portion consisting essentially of:
total iron expressed in terms of weight percentage of “Fe 2 O 3 ” ranging from equal to or less than 0.60 weight percent;
TiO 2 ranging from 0.1 to 1.0 weight percent, and
a redox ratio ranging from 0.36 to 0.42, wherein the weight percents are based on the total weight of the composition, and the redox ratio is the amount of iron in the ferrous state expressed as “FeO” divided by the amount of total iron expressed as “Fe 2 O 3 ”, and
the glass sheet exhibits the following performance properties at a thickness of 0.189 inches (4.8 mm):
an Lta of at least 70%;
a TSET of up to 48%;
a SAE UV of up to 55%;
a dominant wavelength ranging from 495 to 535 nm; and
a Pe of at least 1%.
2. The glass sheet according to claim 1 , wherein the total iron ranges from 0.40 to 0.59 weight percent; the TiO 2 ranges from 0.2 to 0.5 weight percent, and the redox ratio ranges from 0.37 to 0.40.
3. 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, and
K 2 O
0 to 5 weight percent, and
a colorant and property modifying portion consisting essentially of;
total iron expressed in terms of weight percentage of “Fe 2 O 3 ” ranging from equal to or less than 0.60 weight percent;
TiO 2 ranging from 0.1 to 1.0 weight percent, and
redox ratio ranging from 0.37 to 0.40 wherein the weight percents are based on the total weight of the composition, and the redox ratio is the amount of iron in the ferrous state expressed as “FeO” divided by the amount of total iron expressed as “Fe 2 O 3 ”, and
wherein the glass sheet exhibits the following performance properties at a thickness of 0.189 inches (4.8 mm):
an Lta of at least 70%;
a TSET of up to 48%;
a SAE UV of up to 42%;
a dominant wavelength ranging from 495 to 500 nm; and
a Pe of at least 1 percent.
4. The glass sheet according to claim 3 , wherein the glass composition has TiO 2 ranging from 0.2 to 0.5 weight percent.
5. A laminated glass article comprising a glass sheet made from 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, and
K 2 O
0 to 5 weight percent,
and a colorant and property modifying portion consisting essentially of:
total iron expressed in terms of weight percentage of “Fe 2 O 3 ” ranging from equal to or less than 0.60 weight percent;
TiO 2 ranging from 0.1 to 1.0 weight percent, and
redox ratio of the glass sheet ranging from 0.37 to 0.40 wherein the weight percents are based on the total weight of the composition, and the redox ratio is the amount of iron in the ferrous state expressed as “FeO” divided by the amount of total iron expressed as “Fe 2 O 3 ”, and
wherein the glass sheet exhibits the following performance properties at a thickness of 0.189 inches (4.8 mm):
an Lta of at least 70 percent;
a TSET of up to 48 percent;
an SAE UV transmittance of up to 55 percent;
a dominant wavelength ranging from 495 to 535 nm; and
a Pe of at least 1 percent.
6. The laminated glass article according to claim 5 wherein the total iron of the glass sheet ranges from 0.40 to 0.59 weight percent.
7. The laminated glass article according to claim 6 , wherein the TiO 2 of the glass sheet ranges from 0.2 to 0.5 weight percent.