Blue glass composition
The present invention provides a blue glass that can be essentially free of selenium and cobalt but still has a blue color and desired luminous transmittance. Additionally, the amount of iron present is comparable to conventional soda-lime-silica glass. The glass of the present invention can have a soda-lime-silica glass base portion, with major colorants that provide the blue color.
1. A blue 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
a major colorant portion comprising:
Fe 2 O 3 (total iron)
0.1 to 0.9 weight percent, and
a combination of
Er 2 O 3
0.1 to 3 weight percent and
Nd 2 O 3
0.1 to 3 weight percent,
wherein the glass is characterized by a dominant wavelength in the range of 480 nm to 495 nm and a light to solar gain ratio in the range of 0.9 to 1.5 at least one thickness in the range of 4 mm to 6 mm wherein the glass is essentially free of cobalt and/or selenium.
2. The blue glass composition according to claim 1 , wherein the glass comprises 0.1 to 1 weight percent Nd 2 O 3 .
3. The blue glass composition according to claim 1 , wherein the total iron is in the range of 0.4 to 0.6 weight percent.
4. The blue-tint glass composition according to claim 1 , wherein the glass has an LSG of greater than or equal to 1.25.
5. The blue glass composition according to claim 1 , wherein the dominant wavelength is 480 nm to 485 nm.
6. The blue glass according to claim 1 , further comprising SO 3 less than or equal to 0.17.
7. The blue glass according to claim 1 , wherein the glass has a TVIS in the range of 50 percent to 67 percent at a thickness of 5.6 mm.
8. The blue glass according to claim 1 wherein the glass has a TSET in the range of 30 percent to 46 percent at a thickness of 5.6 mm.
9. The blue glass according to claim 1 , wherein the glass has a shading coefficient in the range of 0.40 to 0.70 at a thickness of 5.6 mm.
10. The blue glass according to claim 1 , wherein the glass has a UV value in the range of 20% to 36% at a thickness of 5.6 mm.
11. The blue glass composition according to claim 1 , wherein the glass has a redox ratio in the range of 0.2 to 0.6.