Low iron, high redox ratio, and high iron, high redox ratio, soda-lime-silica glasses and methods of making same
A glass has a basic soda-lime-silica glass portion, and a colorant portion including total iron as Fe 2 O 3 in the range of greater than zero to 0.10 weight percent, e.g. selected from the group of total iron as Fe 2 O 3 in the range of greater than zero to 0.02 weight percent and total iron as Fe 2 O 3 in the range of greater than 0.02 weight percent to less than 0.10 weight percent; redox ratio in the range of 0.2 to 0.6, and tin and/or tin compounds, e.g. SnO 2 greater than 0.000 to 5.0 weight percent. In one embodiment of the invention, the glass has a tin side and an opposite air side, wherein the tin side of the glass is supported on a molten tin bath during forming of the glass. The tin concentration at the tin side of the glass is greater than, less than, or equal to the tin concentration in “body portion” of the glass. The “body portion” of the glass extending from the air side of the glass toward the tin side and terminating short of the tin side of the glass.
1. A glass, comprising:
a basic soda-lime-silica glass portion, wherein the basic soda-lime-silica glass portion comprises:
SiO 2
65-80
wt. %
Na 2 O
10-20
wt. %
CaO
5-15
wt. %
MgO
0-8
wt. %
Al 2 O 3
0-5
wt. %
K 2 O
0-5
wt. %;
a colorant portion, the colorant portion comprising CoO and/or Nd 2 O 3 ,
total iron as Fe 2 O 3 in the range of greater than zero to 0.02 weight percent;
a redox ratio in the range of 0.35 to 0.6, and
tin metal providing tin in an amount within the range of greater than 0.005 to 5.0 weight percent;
the glass product has an LTA of greater than or equal to 85%; a dominant wavelength in the range of 480 to 510 nanometers; an excitation purity in the range of 0.10 to 0.15%; a TSUV in the range of 85 to 90%; a TSIR in the range of 85 to 90% and a TSET in the range of 87 to 91% at a thickness of 5.6 mm, and
wherein the glass product has a melting temperature of at most 2650° F., and
wherein the glass product has a tin side and an opposite air side, said tin side of the glass having a higher concentration of tin than the air side, the air side having a uniform concentration of tin from the air side of the glass product towards the tin side of the glass product.
2. The glass according to claim 1 wherein the glass comprises:
Ingredient
Ingredient in wt. %
SiO 2
73.11
Na 2 O
13.65
K 2 O
0.01
CaO
8.68
MgO
3.16
A l2 O 3
0.03
Fe 2 O
0.0097
SrO
0.02
SO 3
0.2
ZrO 2
0.001
FeO/Fe 2 O 3
0.505
SnO 2
0.111.
3. The glass according to claim 1 wherein the tin metal at the air side has a concentration of tin in the range of greater than 0.005 to 5.0 weight percent.
4. The glass according to claim 1 , wherein the amount of the tin metal is in the range of greater than 0.015 to 0.58 weight percent.
5. The glass according to claim 1 , wherein the amount of tin metal is in the range of greater than 0.1 to less than or equal to 0.2 weight percent.
6. The glass according to claim 1 , wherein the amount of the tin metal is in the range of 0.4 to 3 weight percent.
7. The glass according to claim 1 , wherein the glass comprises tin oxide in the range of greater than 0 to 0.70 weight percent.
8. The glass according to claim 1 wherein the glass batch has a redox ratio in the range of greater than 0.35 up to 0.60.
9. The glass according to claim 1 , wherein the colorant comprises greater than 0 to 0.1 Nd 2 O 3 ; greater than 0 to 40 ppm CoO; greater than 0 to 0.05 weight percent Cr 2 O 3 ; greater than 0 to 0.05 weight percent TiO 2 ; greater than 0 to 1 weight percent CeO 2 , or greater than 0 to 1 weight percent MnO 2 .
10. The glass according to claim 1 , further comprising graphite in the range of greater than zero to 0.15 weight percent.
11. The glass according to claim 1 , wherein the glass has an LTA of at least 91.23%; a dominant wavelength of 496.66 nanometers; an excitation purity of 0.14%; a TSUV of 89.07%; a TSIR of 87.82% and a TSET of 89.43% at a thickness of 5.6 mm.
12. The glass according to claim 1 , wherein the glass has water in the range of 200 to 700 parts per million.