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US 12,630,460 B2Granted
High alumina low soda glass compositions
AssigneeVitro Flat Glass LLC
InventorsJohn Rich, Alan Miller, José Guadalupe Cid-Aguilar
Life of this patent
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Abstract
A glass composition includes a base glass portion comprising: 65-75 wt % SiO2; 5-15 wt % CaO; 0-5 wt % MgO; 0-5 wt % K2O; 10-14 wt % Na2O; and 1-5 wt % Al2O3; wherein the glass composition has a ratio of Na2O to Al2O3 is in the range of 9.5-12.5 wt %/wt %.
Claims14
A glass composition comprising:
- a base glass portion comprising:
- 65-75 wt % SiO2;
- 5-9.5 wt % CaO;
- 2.6-5 wt % MgO;
- 0-5 wt % K2O;
- 10-14 wt % Na2O;
- and
- 0.8-1.47 wt % Al2O3;
- and
- a colorant portion comprising:
- 30 to 120 ppm of CoO;
- and
- no more than 7.5 ppm selenium,
- wherein the glass composition has a ratio of Na2O to Al2O3 in the range of 10.0-11.5 wt. %/wt.%, wherein the glass composition has a ratio of CaO to MgO in the range of 1.7 to 1.9 wt. %/wt.%, wherein the glass composition has an iron redox ratio in the range of 0.221-0.311, wherein the total iron in the glass composition is in the range of 0.01 to 0.30 wt. %, and wherein a glass sheet formed from the glass composition has an a* in the range of −3 to +1 and a b* in the range of −2 to −12.
11 more elements
A glass composition comprising:
- a base glass portion comprising:
- 71.2-71.6 wt. % SiO2;
- 8.3-8.6 wt. % CaO;
- 5.0-5.2 wt. % MgO;
- 0.24-0.25 wt. % K2O;
- 13.4-13.5 wt. % Na2O;
- and
- 1.1-1.2 wt. % Al2O3;
- and
- a colorant portion comprising:
- 30 to 120 ppm of CoO;
- and
- no more than 7.5 ppm selenium,
- wherein the glass composition has a ratio of Na2O to Al2O3 in the range of 11.17-12.27 wt. %/wt.%, wherein the glass composition has an iron redox ratio in the range of 0.221-0.311, wherein the total iron in the glass composition is in the range of 0.01 to 0.30 wt. %, and wherein a glass sheet formed from the glass composition has an a* in the range of −2.5 to 0 and a b* in the range of −5 to −9.
11 more elements
Dependencies are inferred from the claim text.