초록 ▼

This invention relates to a flat float glass that can be prestressed or transformed into a glass ceramic with high quartz mixed crystals or keatite mixed crystals. To eliminate undesirable surface defects during floating and to achieve superior characteristics of the glass or of he glass ceramic, in

This invention relates to a flat float glass that can be prestressed or transformed into a glass ceramic with high quartz mixed crystals or keatite mixed crystals. To eliminate undesirable surface defects during floating and to achieve superior characteristics of the glass or of he glass ceramic, in particular with regard to a low coefficient of thermal expansion and high light transmittance, the glass has a concentration of less than 300 ppb Pt, less than 30 ppb Rh, less than 1.5 wt. % ZnO and less than 1 wt. % SnO2, and is refined during melting without the use of the conventional fining agents arsenic oxide and/or antimony oxide.

대표청구항 ▼

1. A flat float glass comprising:platinum, rhodium, zinc oxide, and tin dioxide, wherein: the concentration of said platinum is contained in a non-zero amount less than 300 parts per billion; the concentration of said rhodium is contained in a non-zero amount less than 30 parts per billion; the conc

1. A flat float glass comprising:platinum, rhodium, zinc oxide, and tin dioxide, wherein: the concentration of said platinum is contained in a non-zero amount less than 300 parts per billion; the concentration of said rhodium is contained in a non-zero amount less than 30 parts per billion; the concentration of said zinc oxide is contained in a non-zero amount less than 1.5 weight percent; the concentration of said tin dioxide is contained in a non-zero amount less than 1 weight percent; said concentrations of said platinum, said rhodium, said zinc oxide, and said tin dioxide configuring said flat float glass to have minimized surface defects; and said flat float glass being configured to be one of: prestressable into a glass-ceramic comprising one of: high quartz mixed crystals; and keatite mixed crystals; and transformable into a glass-ceramic comprising one of: high quartz mixed crystals; and keatite mixed crystals. 2. The flat float glass according to claim 1, wherein:said flat float glass comprises refined glass; said refined glass being substantially free of both of (i.) and (ii.): (i.) arsenic oxide; and (ii.) antimony oxide; to minimize surface metallic coatings. 3. The flat float glass according to claim 2, wherein said flat float glass comprises a lithium oxide?aluminum oxide?silicon dioxide glass.4. The flat float glass according to claim 3, wherein said flat float glass contains in weight percent on an oxide basis:lithium oxide (Li2O)3.2-5.0aluminum oxide (Al2O3)19-25silicon dioxide (SiO2)?55-69.5. The flat float glass according to claim 3, wherein said flat float glass further contains in weight percent on an oxide basis:sodium oxide (Na2O)??0-1.5potassium oxide (K2O)??0-1.5with the sum of sodium oxide (Na2O) +0.2-2.0potassim oxide (K2O)magnesium oxide (MgO)0.1-2.2calcium oxide (CaO)??0-1.5strontium oxide (SrO)??0-1.5barium oxide (BaO)??0-2.5zinc oxide (ZnO)?1.5titanium dioxide (TiO2)1.0-5.0zirconium dioxide (ZrO2)1.0-2.5tin dioxide (SnO2)?1.0with the sum of titanium dioxide (TiO2) +2.5-5.0zirconium (ZrO2) + tin dioxide (SnO2)phosphoric oxide (P2O5)?0-3.0.6. The flat float glass according to claim 2, comprising one of (i.), (ii.), (iii.), (iv.), (v.), (vi.), (vii.), (viii.), (ix.), (x.), (xi.), (xii.), and (xiii.):(i.) said flat float glass comprises in weight percent on an oxide basis a composition of: lithium oxide (Li2O)3.2-5.0sodium oxide (Na2O)??0-1.5potassium oxide (K2O)??0-1.5with the sum of sodium oxide (Na2O) +0.2-2.0potassium oxide (K2O)magnesium oxide (MgO)0.1-2.2calcium oxide (CaO)??0-1.5strontium oxide (SrO)??0-1.5barium oxide (BaO)??0-2.5zinc oxide (ZnO)<1.5aluminum oxide (Al2O3)19-25silicon dioxide (SiO2)55-69titanium dioxide (TiO2)1.0-5.0zirconium dioxide (ZrO2)1.0-2.5tin dioxide (SnO2)<1.0with the sum of titanium dioxide (TiO2) +2.5-5.0zirconium dioxide (ZrO2) +tin dioxide (SnO2)phosphoric oxide (P2O5)?0-3.0;(ii.) said flat float glass comprises colored glass; said colored glass comprises a coloring agent; said coloring agent comprises at least one compound of: vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), copper (Cu), nickel (Ni), selenium (Se), and chlorine (Cl); (iii.) said flat float glass comprises in weight percent on an oxide basis a composition of: lithium oxide (Li2O)3.5-4.5sodium oxide (Na2O)0.2-1.0potassium oxide (K2O)??0-0.8with the sum of sodium oxide (Na2O) +0.4-1.5potassium oxide (K2O)magnesium oxide (MgO)0.3-2.0calcium oxide (CaO)??0-1.0strontium oxide (SrO)??0-1.0barium oxide (BaO)??0-2.5zinc oxide (ZnO)?1.0aluminum oxide (Al2O3)19-24silicon dioxide (SiO2)60-68titanium dioxide (TiO2)1.0-2.0zirconium dioxide (ZrO2)1.2-2.2tin dioxide (SnO2)?0.6with the sum of titanium dioxide (TiO2) +3.0-4.5zirconium dioxide (ZrO2) +tin dioxide (SnO2)phosphoric oxide (P2O5)?0-2.0;(iv.) said flat float glass comprises glass being configured to be chemically prestressable; and the sum of the percentage of lithium oxide (Li2O) and the percentage of sodium oxide (Na2O) being greater than 3.5 percent by weight based on oxide; (v.) said flat float glass comprises chemically prestressable glass; (vi.) said flat float glass comprises: the sum of 3.2 times the percentage of zinc oxide (ZnO) and the percentage of titanium dioxide (TiO2) being equal to or less than 4.3 weight percent based on oxide to minimize surface crystal bands; (vii.) said flat float glass comprises less than 200 parts per million iron oxide (Fe2O3); and less than 2.5 weight percent of titanium dioxide (TiO2), on an oxide basis; to minimize coloration due to iron oxide and titanium dioxide upon vitrification of said flat float glass; (viii.) said flat float glass comprises glass being configured to have, at a thickness of 4 millimeter, light transmittances of one of: more than 89 percent; and more than 90 percent; (ix.) said flat float glass being substantially free of: barium oxide (BaO); (x.) said flat float glass is configured to have: a coefficient of thermal expansion α20/300 between 3.5 millionths per degree Kelvin and 5.0 millionths per degree Kelvin; a transformation temperature Tg between 600 and 750 degrees Celsius; and a processing temperature VA below 1350 degrees Celsius; (xi.) said flat float glass comprises one of: (a.) a flat float glass being configured to be transformable into one of: a transparent glass-ceramic; a translucent glass-ceramic; and an opaque glass-ceramic; (b.) a flat float glass being configured to be transformable into a glass-ceramic comprising keatite mixed crystals as the predominant crystal phase and said flat float glass being configured to have a coefficient of thermal expansion α20/700 of less than 1.5 millionths per degree Kelvin; (c.) a flat float glass being configured to be transformable into a glass-ceramic comprising high quartz mixed crystals as the predominant crystal phase and said flat float glass being configured to have a coefficient of thermal expansion α20/700 in the range of one of: from minus 0.5 five millionths per degree Kelvin to 0.5 millionths per degree Kelvin; and minus 0.15 millionths per degree Kelvin to 0.15 millionths per degree Kelvin; (xii.) said flat float glass comprises a flat float glass transformable into a transparent glass-ceramic; said glass-ceramic comprising in weight percent based on oxide: less than 2 percent of titanium dioxide (TiO2); less than 0.5 percent of tin dioxide (SnO2); and less than 200 parts per million iron oxide (Fe2O3); and said glass-ceramic being configured to have a light transmittance, at 4 millimeters thickness, of less than eighty percent; (xiii.) said flat float glass comprises a flat float glass being configured to be transformable into a glass-ceramic; said glass-ceramic being colored with a coloring agent comprising at least one compound of: vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni); said glass-ceramic being configured to have a light transmittance of less than five percent at a thickness of 4 millimeters. 7. The flat float glass according to claim 2, comprising all of: (i.), (ii.), (iii.), (iv.), (v.), and (vi.):(i.) one of (a.) and (b.): (a.) said flat float glass comprises in weight percent on an oxide basis a composition of: lithium oxide (Li2O)3.2-5.0sodium oxide (Na2O)??0-1.5potassium oxide (K2O)??0-1.5with the sum of sodium oxide (Na2O) +0.2-2.0potassium oxide (K2O)magnesium oxide (MgO)0.1-2.2calcium oxide (CaO)??0-1.5strontium oxide (SrO)??0-1.5barium oxide (BaO)??0-2.5zinc oxide (ZnO)<1.5aluminum oxide (Al2O3)19-25silicon dioxide (SiO2)55-69titanium dioxide (TiO2)1.0-5.0zirconium dioxide (ZrO2)1.0-2.5tin dioxide (SnO2)<1.0with the sum of titanium dioxide (TiO2) +2.5-5.0zirconium dioxide (ZrO2) +tin dioxide (SnO2)phosphoric oxide (P2O5)????0-3.0; and(b.) said flat float glass comprises in weight percent on an oxide basis a composition of: lithium oxide (Li2O)3.5-4.5sodium oxide (Na2O)0.2-1.0potassium oxide (K2O)??0-0.8with the sum of sodium oxide (Na2O) +0.4-1.5potassium oxide (K2O)magnesium oxide (MgO)0.3-2.0calcium oxide (CaO)??0-1.0strontium oxide (SrO)??0-1.0barium oxide (BaO)??0-2.5zinc oxide (ZnO)?1.0aluminum oxide (Al2O3)19-24silicon dioxide (SiO2)60-68titanium dioxide (TiO2)1.0-2.0zirconium dioxide (ZrO2)1.2-2.2tin dioxide (SnO2)?0.6with the sum of titanium dioxide (TiO2) +3.0-4.5zirconium dioxide (ZrO2) +tin dioxide (SnO2)phosphoric oxide (P2O5)?0-2.0;(ii.) said flat float glass comprises the sum of 3.2 times the percentage of zinc oxide (ZnO) and the percentage of titanium dioxide (TiO2) being equal to or less than 4.3 weight percent based on oxide to minimize surface crystal bands; (iii.) said flat float glass comprises: less than 200 parts per million iron oxide (Fe2O3); and less than 2.5 weight percent of titanium dioxide (TiO2), on an oxide basis; to minimize coloration due to iron oxide and titanium dioxide upon vitrification of said flat float glass; (iv.) said flat float glass comprises glass configured to have, at a thickness of 4 millimeters, light transmittances of one of: more than 89 percent; and more than 90 percent; (v.) said flat float glass being substantially free of: barium oxide (BaO); (vi.) said flat float glass is configured to have: a coefficient of thermal expansion α20/300 between 3.5 millionths per degree Kelvin and 5.0 millionths per degree Kelvin; a transformation temperature Tg between 600 and 750 degrees Celsius; and a processing temperature VA below 1350 degrees Celsius. 8. The flat float glass according to claim 7, comprising one of (viii.), (ix.), (x.), (xi.), and (xii.):(viii.) said flat float glass comprises colored glass; said colored glass comprises a coloring agent; said coloring agent comprising at least one compound of: vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Go), copper (Cu), nickel (Ni), selenium (Se), and chlorine (Cl); (ix.) said flat float glass comprises one of: (a.) a flat float glass being configured to be transformable into one of: a transparent glass-ceramic; a translucent glass-ceramic; and an opaque glass-ceramic; (b.) a flat float glass being configured to be transformable into a glass-ceramic comprising keatite mixed crystals as the predominant crystal phase and said flat float glass being configured to have a coefficient of thermal expansion α20/700 of less than 1.5 millionths per degree Kelvin; (c.) a flat float glass being configured to be transformable into a glass-ceramic comprising high quartz mixed crystals as the predominant crystal phase and said flat float glass being configured to have a coefficient of thermal expansion α20/700 in the range of one of; from minus 0.5 five millionths per degree Kelvin to 0.5 millionths per degree Kelvin; and minus 0.15 millionths per degree Kelvin to 0.15 millionths per degree Kelvin; (x.) said flat float glass comprises a flat float glass configured to be transformable into a transparent glass-ceramic; said glass-ceramic comprising in weight percent based on oxide: less than 2 percent of titanium dioxide (TiO2); less than 0.5 percent of tin dioxide (SnO2); and less than 200 parts per million iron oxide (Fe2O3); and said glass-ceramic being configured to have a light transmittance, at 4 millimeters thickness, of less than eighty percent; (xi.) said flat float glass comprises an flat float glass being configured to be transformable into a glass-ceramic; said glass-ceramic being colored with a coloring agent comprising at least one compound of: vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni); said glass-ceramic being configured to have a light transmittance of less than five percent at a thickness of 4 millimeters; and (xii.) said flat float glass comprises glass being configured to be chemically prestressable; said chemically prestressable glass comprises the sum of the percentage of lithium oxide (Li2O) and the percentage of sodium oxide (Na2O) being greater than 3.5 percent by weight based on oxide. 9. A glass ceramic comprising:platinum, rhodium, zinc oxide, and tin dioxide, wherein: the concentration of said platinum is contained in a non-zero amount less than 300 parts per billion; the concentration of said rhodium is contained in a non-zero amount less than 30 parts per billion; the concentration of said zinc oxide is contained in a non-zero amount less than 1.5 weight percent; the concentration of said tin dioxide is contained in a non-zero amount less than 1 weight percent; and said glass ceramic comprising one of: high quartz mixed crystals; and keatite mixed crystals. 10. The glass ceramic according to claim 9, comprising one of (i.), (ii.), (iii.), (iv.), (v.), (vi.), (vii.), viii.), (ix.), (x.), (xi.), (xii.), and (xiii.):(i.) said glass ceramic comprises in weight percent on an oxide basis a composition of: lithium oxide (Li2O)3.2-5.0sodium oxide (Na2O)??0-1.5potassium oxide (K2O)??0-1.5with the sum of sodium oxide (Na2O) +0.2-2.0potassium oxide (K2O)magnesium oxide (MgO)0.1-2.2calcium oxide (CaO)??0-1.5strontium oxide (SrO)??0-1.5barium oxide (BaO)??0-2.5zinc oxide (ZnO)<1.5aluminum oxide (Al2O3)19-25silicon dioxide (SiO2)55-69titanium dioxide (TiO2)1.0-5.0zirconium dioxide (ZrO2)1.0-2.5tin dioxide (SnO2)<1.0with the sum of titanium dioxide (TiO2) +2.5-5.0zirconium dioxide (ZrO2) +tin dioxide (SnO2)phosphoric oxide (P2O5)?0-3.0;(ii.) said glass ceramic comprises colored glass: said colored glass comprises a coloring agent; said coloring agent comprises at least one compound of: vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), copper (Cu), nickel (Ni), selenium (Se), and chlorine (Cl); (iii.) said glass ceramic comprises in weight percent on an oxide basis a composition of: lithium oxide (Li2O)3.5-4.5sodium oxide (Na2O)0.2-1.0potassium oxide (K2O)??0-0.8with the sum of sodium oxide (Na2O) +0.4-1.5potassium oxide (K2O)magnesium oxide (MgO)0.3-2.0calcium oxide (CaO)??0-1.0strontium oxide (SrO)??0-1.0barium oxide (BaO)??0-2.5zinc oxide (ZnO)?1.0aluminum oxide (Al2O3)19-24silicon dioxide (SiO2)60-68titanium dioxide (TiO2)1.0-2.0zirconium dioxide (ZrO2)1.2-2.2tin dioxide (SnO2)?0.6with the sum of titanium dioxide (TiO2) +3.0-4.5zirconium dioxide (ZrO2) +tin dioxide (SnO2)phosphoric oxide (P2O5)?0-2.0;(iv.) said glass ceramic comprises chemically prestressed float glass; said chemically prestressed glass comprises: the sum of the percentage of lithium oxide (Li2O) and the percentage of sodium oxide (Na2O) being greater than 3.5 percent by weight based on oxide; (v.) said glass ceramic comprises chemically prestressed glass; (vi.) said glass ceramic comprises: the sum of 3.2 times the percentage of zinc oxide (ZnO) and the percentage of titanium dioxide (TiO2) being equal to or less than 4.3 weight percent based on oxide; to minimize surface crystal bands; (vii.) said glass ceramic comprises: less than 200 parts per million iron oxide (Fe2O3); and less than 2.5 weight percent of titanium dioxide (TiO2), on an oxide basis; to minimize coloration due to iron oxide and titanium dioxide upon vitrification of said glass ceramic; (viii.) said glass ceramic comprises glass being configured to have, at a thickness of 4 millimeters, light transmittances of one of: more than 89 percent; and more than 90 percent; (ix.) said glass ceramic being substantially free of barium oxide (BaO); (x.) said glass ceramic is configured to have: a coefficient of thermal expansion α20/300 between 3.5 millionths per degree Kelvin and 5.0 millionths per degree Kelvin; a transformation temperature Tg between 600 and 750 degrees Celsius; and a processing temperature VA below 1350 degrees Celsius; (xi.) said glass ceramic comprises one of: (a.) a glass ceramic comprising one of: a transparent glass-ceramic; a translucent glass-ceramic; and an opaque glass-ceramic; (b.) a glass-ceramic comprising keatite mixed crystals as the predominant crystal phase and said glass-ceramic being configured to have a coefficient of thermal expansion α20/700 of less than 1.5 millionths per degree Kelvin; (c.) a glass-ceramic comprising high quartz mixed crystals as the predominant crystal phase and said glass-ceramic being configured to have a coefficient of thermal expansion α20/700 in the range of one of: from minus 0.5 five millionths per degree Kelvin to 0.5 millionths per degree Kelvin; and minus 0.15 millionths per degree Kelvin to 0.15 millionths per degree Kelvin; (xii.) said glass ceramic comprises a transparent glass-ceramic comprising in weight percent based on oxide; less than 2 percent of titanium dioxide (TiO2); less than 0.5 percent of tin dioxide (SnO2); and less than 200 parts per million iron oxide (Fe2O3); and said glass-ceramic being configured to have a light transmittance, at 4 millimeters thickness, of less than eighty percent; (xiii.) said glass ceramic comprises a glass-ceramic being colored with a coloring agent comprising at least one compound of: vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni); said colored glass-ceramic being configured to have a light transmittance of less than five percent at a thickness of 4 millimeters; and wherein said glass ceramic contains lithium oxide?aluminum oxide?silicon dioxide. 11. The glass ceramic according to claim 9, comprising all of: (i.), (ii.), (iii.), (iv.), (v.), and (vi.):(i.) one of (a.) and (b.): (a.) said glass ceramic comprises in weight percent on an oxide basis a composition of: lithium oxide (Li2O)3.2-5.0sodium oxide (Na2O)??0-1.5potassium oxide (K2O)??0-1.5with the sum of sodium oxide (Na2O) +0.2-2.0potassium oxide (K2O)magnesium oxide (MgO)0.1-2.2calcium oxide (CaO)??0-1.5strontium oxide (SrO)??0-1.5barium oxide (BaO)??0-2.5zinc oxide (ZnO)<1.5aluminum oxide (Al2O3)19-25silicon dioxide (SiO2)55-69titanium dioxide (TiO2)1.0-5.0zirconium dioxide (ZrO2)1.0-2.5tin dioxide (SnO2)<1.0with the sum of titanium dioxide (TiO2) +2.5-5.0zirconium dioxide (ZrO2) +tin dioxide (SnO2)phosphoric oxide (P2O5)?0-3.0;(b.) said glass ceramic comprises in weight percent on an oxide basis a composition of: lithium oxide (Li2O)3.5-4.5sodium oxide (Na2O)0.2-1.0potassium oxide (K2O)??0-0.8with the sum of sodium oxide (Na2O) +0.4-1.5potassium oxide (K2O)magnesium oxide (MgO)0.3-2.0calcium oxide (CaO)??0-1.0strontium oxide (SrO)??0-1.0barium oxide (BaO)??0-2.5zinc oxide (ZnO)?1.0aluminum oxide (Al2O3)19-24silicon dioxide (SiO2)60-68titanium dioxide (TiO2)1.0-2.0zirconium dioxide (ZrO2)1.2-2.2tin dioxide (SnO2)?0.6with the sum of titanium dioxide (TiO2) +3.0-4.5zirconium dioxide (ZrO2) +tin dioxide (SnO2)phosphoric oxide (P2O5)?0-2.0;(ii.) said glass ceramic comprises: the sum of 3.2 times the percentage of zinc oxide (ZnO) and the percentage of titanium dioxide (TiO2) being equal to or less than 4.3 weight percent based on oxide; to minimize surface crystal bands; (iii.) said glass ceramic comprises: less than 200 parts per million iron oxide (Fe2O3); and less than 2.5 weight percent of titanium dioxide (TiO2), on an oxide basis; to minimize coloration due to iron oxide and titanium dioxide upon vitrification; (iv.) said glass ceramic comprises glass configured to have, at a thickness of 4 millimeters, light transmittances of one of: more than 89 percent; and more than 90 percent; (v.) said glass ceramic being substantially free of barium oxide (BaO); (vi.) said glass ceramic is configured to have: a coefficient of thermal expansion α20/300 between 3.5 millionths per degree Kelvin and 5.0 millionths per degree Kelvin; a transformation temperature Tg between 600 and 750 degrees Celsius; and a processing temperature VA below 1350 degrees Celsius; and wherein said glass ceramic contains lithium oxide?aluminum oxide?silicon dioxide. 12. The glass ceramic according to claim 11 comprising one of (viii.), (ix.), (x.), (xi.), and (xii.):(viii.) said glass ceramic comprises colored glass; said colored glass comprises a coloring agent; said coloring agent comprising at least one compound of: vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), copper (Cu), nickel (Ni), selenium (Se), and chlorine (Cl); (ix.) said glass ceramic comprises one of: (a.) a transparent glass-ceramic; a translucent glass-ceramic; and an opaque glass-ceramic; (b.) a glass-ceramic comprising keatite mixed crystals as the predominant crystal phase and said glass-ceramic being configured to have a coefficient of thermal expansion α20/700 of less than 1.5 millionths per degree Kelvin; (c.) a glass-ceramic comprising high quartz mixed crystals as the predominant crystal phase and said glass-ceramic being configured to have a coefficient of thermal expansion α20/700 in the range of one of: from minus 0.5 five millionths per degree Kelvin to 0.5 millionths per degree Kelvin; and minus 0.15 millionths per degree Kelvin to 0.15 millionths per degree Kelvin; (x.) said glass ceramic comprises a transparent glass-ceramic comprising in weight percent based on oxide: less than 2 percent of titanium dioxide (TiO2); less than 0.5 percent of tin dioxide (SnO2); and less than 200 parts per million iron oxide (Fe2O3); and said glass-ceramic being configured to have a light transmittance, at 4 millimeters thickness, of less than eighty percent; (xi.) said glass ceramic comprises a glass-ceramic being colored with a coloring agent comprising at least one compound of: vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni); said colored glass-ceramic being configured to have a light transmittance of less than five percent at a thickness of 4 millimeters; and (xii.) said glass ceramic comprises chemically prestressed glass; said chemically prestressed glass comprises: the sum of the percentage of lithium oxide (Li2O) and the percentage of sodium oxide (Na2O) being greater than 3.5 percent by weight based on oxide. 13. A float glass comprising:platinum, wherein the concentration of said platinum is contained in a non-zero amount less than 300 parts per billion; a concentration of rhodium in a non-zero amount less than 30 parts per billion; a concentration of zinc oxide in a non-zero amount less than 1.5 weight percent; a concentration of tin dioxide in a non-zero amount less than 1 weight percent; said concentrations of said platinum, rhodium, zinc oxide, and tin dioxide configuring said float glass to have minimized surface defects; and said float glass being configured to be one of: prestressable into a glass-ceramic comprising one of: high quartz mixed crystals; and keatite mixed crystals; and transformable into a glass-ceramic comprising one of: high quartz mixed crystals; and keatite mixed crystals. 14. The float glass according to claim 3, wherein:said float glass comprises rhodium, zinc oxide, and tin dioxide; said float glass comprises refined glass; said refined glass being substantially free of both of (i.) and (ii.): (i.) arsenic oxide; and (ii.) antimony oxide; to minimize surface metallic coatings; said float glass comprises a lithium oxide?aluminum oxide?silicon dioxide glass; said float glass contains in weight percent on an oxide basis: lithium oxide (Li2O)3.2-5.0aluminum oxide (Al2O3)19-25silicon dioxide (SiO2)55-69sodium oxide (Na2O)??0-1.5potassium oxide (K2O)??0-1.5with the sum of sodium oxide (Na2O) +0.2-2.0potassium oxide (K2O)magnesium oxide (MgO)0.1-2.2calcium oxide (CaO)??0-1.5strontium oxide (SrO)??0-1.5barium oxide (BaO)??0-2.5zinc oxide (ZnO)?1.5titanium dioxide (TiO2)1.0-5.0zirconium dioxide (ZrO2)1.0-2.5tin dioxide (SnO2)?1.0with the sum of titanium dioxide (TiO2) +2.5-5.0zirconium (ZrO2) + tin dioxide (SnO2)phosphoric oxide (P2O5)?0-3.0.15. The float glass according to claim 14, comprising one of (i.), (ii.), (iii.), (iv.), (v.), (vi.), (vii.), (viii.), (ix.), (x.), (xi.), (xii.), and (xiii.):(i.) said float glass comprises in weight percent on an oxide basis a composition of: lithium oxide (Li2O)3.2-5.0sodium oxide (Na2O)??0-1.5potassium oxide (K2O)??0-1.5with the sum of sodium oxide (Na2O) +0.2-2.0potassium oxide (K2O)magnesium oxide (MgO)0.1-2.2calcium oxide (CaO)??0-1.5strontium oxide (SrO)??0-1.5barium oxide (BaO)??0-2.5zinc oxide (ZnO)<1.5aluminum oxide (Al2O3)19-25silicon dioxide (SiO2)55-69titanium dioxide (TiO2)1.0-5.0zirconium dioxide (ZrO2)1.0-2.5tin dioxide (SnO2)<1.0with the sum of titanium dioxide (TiO2) +2.5-5.0zirconium dioxide (ZrO2) +tin dioxide (SnO2)phosphoric oxide (P2O5)?0-3.0;(ii.) said float glass comprises colored glass; said colored glass comprises a coloring agent; said coloring agent comprises at least one compound of: vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), copper (Cu), nickel (Ni), selenium (Se), and chlorine (Cl); (iii.) said float glass comprises in weight percent on an oxide basis a composition of: lithium oxide (Li2O)3.5-4.5sodium oxide (Na2O)0.2-1.0potassium oxide (K2O)??0-0.8with the sum of sodium oxide (Na2O) +0.4-1.5potassium oxide (K2O)magnesium oxide (MgO)0.3-2.0calcium oxide (CaO)??0-1.0strontium oxide (SrO)??0-1.0barium oxide (BaO)??0-2.5zinc oxide (ZnO)?1.0aluminum oxide (Al2O3)19-24silicon dioxide (SiO2)60-68titanium dioxide (TiO2)1.0-2.0zirconium dioxide (ZrO2)1.2-2.2tin dioxide (SnO2)?0.6with the sum of titanium dioxide (TiO2) +3.0-4.5zirconium dioxide (ZrO2) +tin dioxide (SnO2)phosphoric oxide (P2O5)?0-2.0;(iv.) said float glass comprises glass being configure to be chemically prestressable; and the sum of the percentage of lithium oxide (Li2O) and the percentage of sodium oxide (Na2O) being greater than 3.5 percent by weight based on oxide; (v.) said float glass comprises chemically prestressable glass; (vi.) said float glass comprises: the sum of 3.2 times the percentage of zinc oxide (ZnO) and the percentage of titanium dioxide (TiO2) being equal to or less than 4.3 weight percent based on oxide to minimize surface crystal bands; (vii.) said float glass comprises: less than 200 parts per million iron oxide (Fe2O3); and less than 2.5 weight percent of titanium dioxide (TiO2), on an oxide basis; to minimize coloration due to iron oxide and titanium dioxide upon vitrification of said float glass; (viii.) said float glass comprises glass being configured to have, at a thickness of 4 millimeters, light transmittances of one of: more than 89 percent; and more than 90 percent; (ix.) said float glass being substantially free of: barium oxide (BaO); (x.) said float glass is configured to have: a coefficient of thermal expansion α20/300 between 3.5 millionths per degree Kelvin and 5.0 millionths per degree Kelvin; a transformation temperature Tg between 600 and 750 degrees Celsius; and processing temperature VA below 1350 degrees Celsius; (xi.) said float glass comprises one of: (a.) a float glass being configured to be transformable into one of: a transparent glass-ceramic; a translucent glass-ceramic; and an opaque glass-ceramic; (b.) a float glass being configured to be transformable into a glass-ceramic comprising keatite mixed crystals as the predominant crystal phase and said float glass being configured to have a coefficient of thermal expansion α20/700 of less than 1.5 millionths per degree Kelvin; (c.) a float glass being configured to be transformable into a glass-ceramic comprising high quartz mixed crystals as the predominant crystal phase and said float glass being configured to have a coefficient of thermal expansion α20/700 in the range of one of: from minus 0.5 five millionths per degree Kelvin to 0.5 millionths per degree Kelvin; and minus 0.15 millionths per degree Kelvin to 0.15 millionths per degree Kelvin; (xii.) said float glass comprises a float glass transformable into a transparent glass-ceramic; said glass-ceramic comprising in weight percent based on oxide: less than 2 percent of titanium dioxide (TiO2); less than 0.5 percent of tin dioxide (SnO2); and less than 200 parts per million iron oxide (Fe2O3); and said glass-ceramic being configured to have a light transmittance, at 4 millimeters thickness, of less than eighty percent; (xiii.) said float glass comprises a float glass being configured to be transformable into a glass-ceramic; said glass-ceramic being colored with a coloring agent comprising at least one compound of: vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni); said glass-ceramic being configured to have a light transmittance of less than five percent at a thickness of 4 millimeters. 16. The float glass according to claim 14, comprising all of: (i.), (ii.), (iii.), (iv.), (v.), and (vi.):(i.) one of (a.) and (b.): (a.) said float glass comprises in weight percent on an oxide basis a composition of: lithium oxide (Li2O)3.2-5.0sodium oxide (Na2O)??0-1.5potassium oxide (K2O)??0-1.5with the sum of sodium oxide (Na2O) +0.2-2.0potassium oxide (K2O)magnesium oxide (MgO)0.1-2.2calcium oxide (CaO)??0-1.5strontium oxide (SrO)??0-1.5barium oxide (BaO)??0-2.5zinc oxide (ZnO)<1.5aluminum oxide (Al2O3)19-25silicon dioxide (SiO2)55-69titanium dioxide (TiO2)1.0-5.0zirconium dioxide (ZrO2)1.0-2.5tin dioxide (SnO2)<1.0with the sum of titanium dioxide (TiO2) +2.5-5.0zirconium dioxide (ZrO2) +tin dioxide (SnO2)phosphoric oxide (P2O5)????0-3.0; and(b.) said float glass comprises in weight percent on an oxide basis a composition of: lithium oxide (Li2O)3.5-4.5sodium oxide (Na2O)0.2-1.0potassium oxide (K2O)??0-0.8with the sum of sodium oxide (Na2O) +0.4-1.5potassium oxide (K2O)magnesium oxide (MgO)0.3-2.0calcium oxide (CaO)??0-1.0strontium oxide (SrO)??0-1.0barium oxide (BaO)??0-2.5zinc oxide (ZnO)?1.0aluminum oxide (Al2O3)19-24silicon dioxide (SiO2)60-68titanium dioxide (TiO2)1.0-2.0zirconium dioxide (ZrO2)1.2-2.2tin dioxide (SnO2)?0.6with the sum of titanium dioxide (TiO2) +3.0-4.5zirconium dioxide (ZrO2) +tin dioxide (SnO2)phosphoric oxide (P2O5)?0-2.0;(ii.) said float glass comprises the sum of 3.2 times the percentage of zinc oxide (ZnO) and the percentage of titanium dioxide (TiO2) being equal to or less than 4.3 weight percent based on oxide to minimize surface crystal bands; (iii.) said float glass comprises: less than 200 parts per million iron oxide (Fe2O3); and less than 2.5 weight percent of titanium dioxide (TiO2), on an oxide basis; to minimize coloration due to iron oxide and titanium dioxide upon vitrification of said float glass; (iv.) said float glass comprises glass configured to have, at a thickness of 4 millimeters, light transmittances of one of: more than 89 percent; and more than 90 percent; (v.) said float glass being substantially free of: barium oxide (BaO); (vi.) said float glass is configured to have: a coefficient of thermal expansion α20/300 between 3.5 millionths per degree Kelvin and 5.0 millionths per degree Kelvin; a transformation temperature Tg between 600 and 750 degrees Celsius; and a processing temperature VA below 1350 degrees Celsius. 17. The float glass according to claim 16 comprising one of (viii.), (ix.), (x.), (xi.), and (xii.):(viii.) said float glass comprises colored glass; said colored glass comprises a coloring agent; said coloring agent comprising at least one compound of: vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), copper (Cu), nickel (Ni), selenium (Se), and chlorine (Cl); (ix.) said float glass comprises one of: (a.) a float glass being configured to be transformable into one of: a transparent glass-ceramic; a translucent glass-ceramic; and an opaque glass-ceramic; (b.) a float glass being configured to be transformable into a glass-ceramic comprising keatite mixed crystals as the predominant crystal phase and said float glass being configured to have a coefficient of thermal expansion α20/700 of less than 1.5 millionths per degree Kelvin; (c.) a float glass being configured to be transformable into a glass-ceramic comprising high quartz mixed crystals as the predominant crystal phase and said float glass being configured to have a coefficient of thermal expansion α20/700 in the range of one of: from minus 0.5 five millionths per degree Kelvin to 0.5 millionths per degree Kelvin; and minus 0.15 millionths per degree Kelvin to 0.15 millionths per degree Kelvin; (x.) said float glass comprises a float glass configured to be transformable into a transparent glass-ceramic; said glass-ceramic comprising in weight percent based on oxide: less than 2 percent of titanium dioxide (TiO2); less than 0.5 percent of tin dioxide (SnO2); and less than 200 parts per million iron oxide (Fe2O3); and said glass-ceramic being configured to have a light transmittance, at 4 millimeters thickness, of less than eighty percent; (xi.) said float glass comprises a float glass being configured to be transformable into a glass-ceramic; said glass-ceramic being colored with a coloring agent comprising at least one compound of: vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni); said glass-ceramic being configured to have a light transmittance of less than five percent at a thickness of 4 millimeters; and (xii.) said float glass comprises glass being configured to be chemically prestressable; said chemically prestressable glass comprises the sum of the percentage of lithium oxide (Li2O) and the percentage of sodium oxide (Na2O) being greater than 3.5 percent by weight based on oxide. 18. A flat glass ceramic comprising:platinum, wherein the concentration of said platinum is contained in a non-zero amount less than 300 parts per billion; a concentration of rhodium in a non-zero amount less than 30 parts per billion; a concentration of zinc oxide in a non-zero amount less than 1.5 weight percent; a concentration of tin dioxide in a non-zero amount less than 1 weight percent; and said flat glass ceramic comprising one high quartz mixed crystals; and keatite mixed crystals. 19. The flat glass ceramic according to claim 18, comprising one of (i.), (ii), (iii.), (iv.), (v.), (vi.), (vii.), (viii.), (ix.), (x.), (xi.), (xii.), (xiii.), and (xiv.):(i.) said flat glass ceramic comprises in weight percent on an oxide basis a composition of: lithium oxide (Li2O)3.2-5.0sodium oxide (Na2O)??0-1.5potassium oxide (K2O)??0-1.5with the sum of sodium oxide (Na2O) +0.2-2.0potassium oxide (K2O)magnesium oxide (MgO)0.1-2.2calcium oxide (CaO)??0-1.5strontium oxide (SrO)??0-1.5barium oxide (BaO)??0-2.5zinc oxide (ZnO)<1.5aluminum oxide (Al2O3)19-25silicon dioxide (SiO2)55-69titanium dioxide (TiO2)1.0-5.0zirconium dioxide (ZrO2)1.0-2.5tin dioxide (SnO2)<1.0with the sum of titanium dioxide (TiO2) +2.5-5.0zirconium dioxide (ZrO2) +tin dioxide (SnO2)phosphoric oxide (P2O5)?0-3.0;(ii.) said flat glass ceramic comprises colored glass; said colored glass comprises a coloring agent; said coloring agent comprises at least one compound of: vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), copper (Cu), nickel (Ni), selenium (Se), and chlorine (Cl); (iii.) said flat glass ceramic comprises in weight percent on an oxide basis a composition of: lithium oxide (Li2O)3.5-4.5sodium oxide (Na2O)0.2-1.0potassium oxide (K2O)??0-0.8with the sum of sodium oxide (Na2O) +0.4-1.5potassium oxide (K2O)magnesium oxide (MgO)0.3-2.0calcium oxide (CaO)??0-1.0strontium oxide (SrO)??0-1.0barium oxide (BaO)??0-2.5zinc oxide (ZnO)?1.0aluminum oxide (Al2O3)19-24silicon dioxide (SiO2)60-68titanium dioxide (TiO2)1.0-2.0zirconium dioxide (ZrO2)1.2-2.2tin dioxide (SnO2)?0.6with the sum of titanium dioxide (TiO2) +3.0-4.5zirconium dioxide (ZrO2) +tin dioxide (SnO2)phosphoric oxide (P2O5)?0-2.0;(iv.) said flat glass ceramic comprises chemically prestressed float glass; said chemically prestressed glass comprises: the sum of the percentage of lithium oxide (Li2O) and the percentage of sodium oxide (Na2O) being greater than 3.5 percent by weight based on oxide; (v.) said flat glass ceramic comprises chemically prestressed glass; (vi.) said flat glass ceramic comprises: the sum of 3.2 times the percentage of zinc oxide (ZnO) and the percentage of titanium dioxide (TiO2) being equal to or less than 4.3 weight percent based on oxide; to minimize surface crystal bands; (vii.) said flat glass ceramic comprises: less than 200 parts per million iron oxide (Fe2O3); and less than 2.5 weight percent of titanium dioxide (TiO2), on an oxide basis; to minimize coloration due to iron oxide and titanium dioxide upon vitrification of said flat float glass; (viii.) said flat glass ceramic comprises glass being configured to have, at a thickness of 4 millimeters, light transmittances of one of: more than 89 percent; and more than 90 percent; (ix.) said flat glass ceramic being substantially free of barium oxide (BaO); (x.) said flat glass ceramic is configured to have: a coefficient of thermal expansion α20/300 between 3.5 millionths per degree Kelvin and 5.0 millionths per degree Kelvin; a transformation temperature Tg between 600 and 750 degrees Celsius; and a processing temperature VA below 1350 degrees Celsius; (xi.) said flat glass ceramic comprises one of: (a.) a flat glass ceramic comprising one of: a transparent glass-ceramic; a translucent glass-ceramic; and an opaque glass-ceramic; (b.) a glass-ceramic comprising keatite mixed crystals as the predominant crystal phase and said glass-ceramic being configured to have a coefficient of thermal expansion α20/700 of less than 1.5 millionths per degree Kelvin; (c.) a glass-ceramic comprising high quartz mixed crystals as the predominant crystal phase and said glass-ceramic being configured to have a coefficient of thermal expansion α20/700 in the range of one of: from minus 0.5 five millionths per degree Kelvin to 0.5 millionths per degree Kelvin; and minus 0.15 millionths per degree Kelvin to 0.15 millionths per degree Kelvin; (xii.) said flat glass ceramic comprises transparent glass-ceramic comprising in weight percent based on oxide: less than 2 percent of titanium dioxide (TiO2); less than 0.5 percent of tin dioxide (SnO2); and less than 200 parts per million iron oxide (Fe2O3); and said glass-ceramic being configured to have a light transmittance, at 4 millimeters thickness, of less than eighty percent; (xiii.) said flat glass ceramic comprises a glass-ceramic being colored with a coloring agent comprising at least one compound of: vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni); said colored glass-ceramic being configured to have a light transmittance of less than five percent at a thickness of 4 millimeters; and (xiv.) said flat glass ceramic contains lithium oxide?aluminum oxide?silicon dioxide; and wherein said flat glass ceramic comprises rhodium, zinc oxide, and tin oxide. 20. The flat glass ceramic according to claim 18, comprising all of: (i.), (ii.), (iii.), (iv.), (v.), and (vi.):(i.) one of (a.) and (b.): (a.) said flat glass ceramic comprises in weight percent on an oxide basis a composition of: lithium oxide (Li2O)3.2-5.0sodium oxide (Na2O)??0-1.5potassium oxide (K2O)??0-1.5with the sum of sodium oxide (Na2O) +0.2-2.0potassium oxide (K2O)magnesium oxide (MgO)0.1-2.2calcium oxide (CaO)??0-1.5strontium oxide (SrO)??0-1.5barium oxide (BaO)??0-2.5zinc oxide (ZnO)<1.5aluminum oxide (Al2O3)19-25silicon dioxide (SiO2)55-69titanium dioxide (TiO2)1.0-5.0zirconium dioxide (ZrO2)1.0-2.5tin dioxide (SnO2)<1.0with the sum of titanium dioxide (TiO2) +2.5-5.0zirconium dioxide (ZrO2) +tin dioxide (SnO2)phosphoric oxide (P2O5)?0-3.0;(b.) said flat glass ceramic comprises in weight percent on an oxide basis a composition of: lithium oxide (Li2O)3.5-4.5sodium oxide (Na2O)0.2-1.0potassium oxide (K2O)??0-0.8with the sum of sodium oxide (Na2O) +0.4-1.5potassium oxide (K2O)magnesium oxide (MgO)0.3-2.0calcium oxide (CaO)??0-1.0strontium oxide (SrO)??0-1.0barium oxide (BaO)??0-2.5zinc oxide (ZnO)?1.0aluminum oxide (Al2O3)19-24silicon dioxide (SiO2)60-68titanium dioxide (TiO2)1.0-2.0zirconium dioxide (ZrO2)1.2-2.2tin dioxide (SnO2)?0.6with the sum of titanium dioxide (TiO2) +3.0-4.5zirconium dioxide (ZrO2) +tin dioxide (SnO2)phosphoric oxide (P2O5)?0-2.0;(ii.) said flat glass ceramic comprises: the sum of 3.2 times the percentage of zinc oxide (ZnO) and the percentage of titanium dioxide (TiO2) being equal to or less than 4.3 weight percent based on oxide; to minimize surface crystal bands; (iii.) said flat glass ceramic comprises: less than 200 parts per million iron oxide (Fe2O3); and less than 2.5 weight percent of titanium dioxide (TiO2), on an oxide basis; to minimize coloration due to iron oxide and titanium dioxide upon vitrification; (iv.) said flat glass ceramic comprises glass configure to have, at a thickness of 4 millimeters, light transmittances of one of: more than 89 percent; and more than 90 percent; (v.) said flat glass ceramic being substantially free of barium oxide (BaO); (vi.) said flat glass ceramic is configured to have: a coefficient of thermal expansion α20/300 between 3.5 millionths per degree Kelvin and 5.0 millionths per degree Kelvin; a transformation temperature Tg between 600 and 750 degrees Celsius; and a processing temperature VA below 1350 degrees Celsius; and comprising one of (viii.), (ix.), (x.), (xi.), and (xii.): (viii.) said flat glass ceramic comprises colored glass; said colored glass comprises a coloring agent; said coloring agent comprising at least one compound of: vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), copper (Cu), nickel (Ni), selenium (Se), and chlorine (Cl); (ix.) said flat glass ceramic comprises one of: (a.) a transparent glass-ceramic; a translucent glass-ceramic; and an opaque glass-ceramic; (b.) a glass-ceramic comprising keatite mixed crystal as the predominant crystal phase and said glass-ceramic being configured to have a coefficient of thermal expansion α20/700 of less than 1.5 millionths per degree Kelvin; (c.) a glass-ceramic comprising high quartz mixed crystals as the predominant crystal phase and said glass-ceramic being configured to have a coefficient of thermal expansion α20/700 in the range of one of: from minus 0.5 five millionths per degree Kelvin to 0.5 millionths per degree Kelvin; and minus 0.15 millionths per degree Kelvin to 0.15 millionths per degree Kelvin; (x.) said flat glass ceramic comprises a transparent glass-ceramic comprising in weight percent based on oxide: less than 2 percent of titanium dioxide (TiO2); less than 0.5 percent of tin dioxide (SnO2); and less than 200 parts per million iron oxide (Fe2O3); and said glass-ceramic being configured to have a light transmittance, at 4 millimeters thickness, of less than eighty percent; (xi.) said flat glass ceramic comprises a glass-ceramic being colored with a coloring agent comprising at least one compound of: vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni); said colored glass-ceramic being configured to have a light transmittance of less than five percent at a thickness of 4 millimeters; and (xii.) said flat glass ceramic comprises chemically prestressed glass; said chemically prestressed glass comprises: the sum of the percentage of lithium oxide (Li2O) and the percentage of sodium oxide (Na2O) being greater than 3.5 percent by weight based on oxide; and wherein said flat glass ceramic comprises rhodium, zinc oxide, and tin oxide.