Flat panel display

Abstract

A flat panel display comprising an aluminosilicate glass panel that exhibits a strain point higher than 640° C., a weight loss less than 20 mg/cm 2 after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95° C., a CTE in the range of 31-57×10 −7 /° C., is nominally free of alkali metal oxides and has a composition consisting essentially of, as calculated in percent by weight on an oxide basis, 49-67% SiO 2 , at least 6% Al 2 O 3 , the Al 2 O 3 being 6-14% in conjunction with 55-67% SiO 2 and 16-23% in conjunction with 49-58% SiO 2 , SiO 2 +Al 2 O 3 >68%, 0-15% B 2 O 3 , at least one alkaline earth metal oxide selected from the group consisting of, in the proportions indicated, 0-21% BaO, 0-15% SrO, 0-18% CaO, 0-8% MgO and 12-30% BaO+CaO+SrO+MgO.

We claim:  
     
       1. A flat panel display comprising an aluminosilicate glass panel that exhibits a strain point higher than 640° C., a weight loss less than 2.5 mg/cm 2  after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95° C., a CTE in the range of 31-57×10 −7 /°C., is nominally free of alkali metal oxides and has a composition consisting essentially of, as calculated in percent by weight on an oxide basis, 49-67% SiO 2 , at least 6% Al 2 O 3 , and Al 2 O 3  being 6-14% in conjunction with 55-67% SiO 2  and 16-23% in conjunction with 49-58% SiO 2 , SiO 2 +Al 2 O 3 >68%, 0 to less than 8% B 2 O 3 , at least one alkaline earth metal oxide selected from the group consisting of, in the proportions indicated, 0-21% BaO, 0-15% SrO, 0-7.1% CaO, 0-8% MgO and 12-30% BaO+CaO+SrO+MgO. 
     
     
       2. A flat panel display in accordance with  claim 1  in which the glass panel has a CTE in the range of 31-44×10 −7 /°C. and the glass is selected from a group of aluminosilicate sub-families consisting of glasses having compositions consisting essentially of, as calculated in weight percent on an oxide basis; 
       a. 49-58% SiO 2 , 17.5-23% Al 2 O 3 , 0 to less than 8% B 2 O 3 , 0-8% MgO, 0-7.1% CaO, 0.4-13.5% SrO, 0-21% BaO and MgO+CaO+SrO+BaO being 13-28%,  
       b. 57-66% SiO 2 , 8-14% Al 2 O 3 , 0 to less than 8% B 2 O 3 , 0-4.5% MgO, 0-7.1% CaO, 0.5-13% SrO and 2-21% BaO.  
     
     
       3. A flat panel display in accordance with  claim 2  in which the glass panel has a CTE in the range of 32-40×10 −7 /°C. and the aluminosilicate sub-families consist essentially of: 
       a. 54-57% SiO 2 , 17.5-23% Al 2 O 3 , 5 to less than 8% B 2 O 3 , 2-2.75% MgO, 1.5- <7% CaO, 2-6% SrO and 0.5-9.5% BaO,  
       b. 57-65.5% SiO 2 , 8-13% Al 2 O 3 , 4 to less than 8% B 2 O 3 , 2-3.5% MgO, 0-6.5% CaO, 0-13% SrO and 2-21% BaO.  
     
     
       4. A flat panel display in accordance with  claim 1  in which the glass panel has a CTE in the range of 44-57×10 −7 /°C. and the glass is selected from a group of aluminosilicate sub-families consisting of glasses having compositions consisting essentially of, as calculated in weight percent on an oxide basis: 
       a. 50-57% SiO 2 , 16-22% Al 2 O 3 , 0-5.5% B 2 O 3 , 0.5-3% MgO, 1-7.1% CaO, 0.5-15% SrO and 1-21% BaO,  
       b. 55-67% SiO 2 , 6-14% Al 2 O 3 , 0-7.5% B 2 O 3 , 0-6.5% MgO, 0-7.1% CaO, 0-15.5% SrO, 1-9.5% BaO and MgO+CaO+SrO+BaO being 16.5- 28%.  
     
     
       5. A flat panel display in accordance with  claim 4  in which the glass panel has a CTE in the range of 45-50×10 −7 /°C. and the aluminosilicate sub-families consist essentially of: 
       a. 50-57% SiO 2 , 16-20% Al 2 O 3 , 0-5.5% B 2 O 3 , 2-2.75% MgO, 1-<7% CaO, 0.5-15% SrO and 1-21% BaO,  
       b. 55-67% SiO 2 , 6-<13% Al 2 O 3 , 0-7.5% B 2 O 3 , 2-6.5% MgO, 0-7.1% CaO, 0-14.5% SrO and 2-9.5% BaO.  
     
     
       6. A flat panel display in accordance with  claim 1  in which the glass panel has a strain point greater than 660° C. and a weight loss less than 1 mg/cm 2  after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95° C., the glass being selected from a group of aluminosilicate sub-families consisting of glasses having compositions consisting essentially of, as calculated in percent by weight on an oxide basis: 
       a. 54-58% SiO 2 , 16-23% Al 2 O 3 , 0-6% B 2 O 3 , 2-4.5% MgO, 1-7.1% CaO, 2.5-15.5% SrO and 0-14.5% BaO, MgO+CaO+SrO+BaO being 15-27%,  
       b. 55-67% SiO 2 , 6-14% Al 2 O 3 , 0-7.5% B 2 O 3 , 0-7% MgO, 0-7.1% CaO, 0-15% SrO, 1-21% BaO, MgO+CaO+SrO+BaO being 18-28%.  
     
     
       7. A flat panel display in accordance with  claim 1  in which the glass panel has a density less than 2.5 grams/cc and a composition, as calculated in weight percent on an oxide basis, consisting essentially of 54.8-57% SiO 2 , 16.8-21.8% Al 2 O 3 , 0 to less than 8% B 2 O 3 , 2.2-2.5% MgO, 1.5-7.1% CaO, 4.5-5.5% SrO, 0.1-14.5% BaO, MgO+CaO+SrO+BaO being 12.5-27%. 
     
     
       8. A method of producing a glass panel for a flat panel display which comprises melting a batch for an aluminosilicate glass consisting essentially of, as calculated in percent by weight on an oxide basis, 49-67% SiO 2 , at least 6% Al 2 O 3 , the Al 2 O 3  being 6-14% in conjunction with 55-67% SiO 2  and 16-23% in conjunction with 49-58% SiO 2 , SiO 2 +Al 2 O 3 >68%, 0 to less than 8% B 2 O 3 , at least one alkaline earth metal oxide selected from the group consisting of, in the indicated proportions, 0-21% BaO, 0-15% SrO, 0-7.1% CaO, 0-8% MgO and 12-30% BaO+CaO,  +SrO+MgO, and drawing a thin sheet of molten glass from the melt. 
     
     
       9. A method in accordance with  claim 8  wherein the glass sheet is drawn by a float process. 
     
     
       10. An aluminosilicate glass exhibiting a strain point higher than 640° C., a weight loss less than 2.5 mg/cm 2  after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95° C., a CTE between 31 and 57×10 −7 /°C., nominally free of alkali metal oxides and having a composition consisting essentially of, as calculated in percent by weight on an oxide basis, 49-67% SiO 2 , at least 6% Al 2 O 3 , the Al 2 O 3  being 6-14% in conjunction with 55-67% SiO 2  and 16-23% in conjunction with 49- 58% SiO 2 , SiO 2 +Al 2 O 3 >68%, 0 to less than 8% B 2 O 3 , at least one alkaline earth metal oxide selected from the group consisting of, in the proportions indicated, 0-21% BaO, 0-15% SrO, 0-7.1% CaO, 0-8% MgO and 12-30% BaO+CaO+SrO+MgO. 
     
     
       11. An aluminosilicate glass in accordance with  claim 10  having a CTE in the range of 31-44×10 −7 /°C. and being selected from a group of aluminosilicate sub-families consisting of glasses having compositions consisting essentially of, as calculated in weight percent on an oxide basis; 
       a. 49-58% SiO 2 , 17.5-23% Al 2 O 3 , 0 to less than 8% B 2 O 3 , 0-8% MgO, 0-7.1% CaO, 0.4-13.5% SrO, 0-21% BaO, the glass containing at least one alkaline earth oxide in the indicated proportion and the total BaO+CaO+SrO+MgO content being 13-28%,  
       b. 57-66% SiO 2 , 8-14% Al 2 O 3 , 0 to less than 8% B 2 O 3 , 0-4.5% MgO, 0-7.1% CaO, 0.5-13% SrO, 2-21% BaO.  
     
     
       12. An aluminosilicate glass in accordance with  claim 11  in which the glass has a CTE of 32-40×10 −7 /°C. and the aluminosilicate sub-families consist essentially of: 
       a. 54-57% SiO 2 , 17.5-23% Al 2 O 3 , 5 to less than 8% B 2 O 3 , 2-2.75% MgO, 1.5-<7% CaO, 2-6% SrO and 0.5-9.5% BaO,  
       b. 57-65.5% SiO 2 , 8-13% Al 2 O 3 , 4 to less than 8% B 2 O 3 , 2-3.5% MgO, 0-6.5% CaO, 0-13% SrO and 2-21% BaO.  
     
     
       13. An aluminosilicate glass in accordance with  claim 10  having a CTE in the range of 44-57×10 −7 /°C. and being selected from a group of aluminosilicate sub-families consisting of glasses having compositions consisting essentially of, as calculated in weight percent on an oxide basis: 
       a. 50-75% SiO 2 , 16-22% Al 2 O 3 , 0-5.5% B 2 O 3 , 0.5-3% MgO, 1-7.1% CaO, 0.5-15% SrO, 1-21% BaO,  
       b. 55-67% SiO 2 , 6-14% Al 2 O 3 , 0-7.5% B 2 O 3 , 0-6.5% MgO, 0-7.1% CaO, 0-15.5% SrO, 1-9.5% BaO, the total MgO+CaO+SrO+BaO being 16.5-28%.  
     
     
       14. An aluminosilicate glass in accordance with  claim 13  in which the glass has a CTE in the range of 45-50×10 −7 /°C. and the aluminosilicate sub-families consist essentially of: 
       a. 50-57% SiO 2 , 16-20% Al 2 O 3 , 0-5.5% B 2 O 3 , 2-2.75% MgO, 1-<7% CaO, 0.5-15% SrO, and 1-21% BaO,  
       b. 55-67% SiO 2 , 6-<13% Al 2 O 3 , 0-7.5% B 2 O 3 , 2-6.5% MgO, 0-7.1% CaO, 0-14.5% SrO and 2-9.5% BaO.  
     
     
       15. An aluminosilicate glass in accordance with  claim 10  having a strain point greater than 660° C. and a weight loss less than 1 mg/cm 2  after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95° C. and being selected from a group of aluminosilicate sub-families consisting of glasses having compositions consisting essentially of, as calculated in percent by weight on an oxide basis: 
       a. 54-58% SiO 2 , 16-23% Al 2 O 3 , 0-6% B 2 O 3 , 2-4.5% MgO, 1-7.1% CaO, 2.5-15.5% SrO and 0-14.5% BaO, MgO+CaO+SrO+BaO being 15-27%,  
       b. 55-67% SiO 2 , 6-14% Al 2 O 3 , 0-7.5% B 2 O 3 , 0-7% MgO, 0-7.1% CaO, 0-15% SrO, 1-21% BaO, MgO+CaO+SrO+BaO being 18-28%.  
     
     
       16. An aluminosilicate glass in accordance with  claim 10  having a density less than 2.5 grams/cc and a composition consisting essentially of 54.8-57% SiO 2 , 16.8-21.8% Al 2 O 3 , 0 to less than 8% B 2 O 3 , 2.2-2.5% MgO, 1.5-7.1% CaO, 4.5-5.5% SrO, 0.1-14.5% BaO, MgO+CaO+SrO+BaO being 12.5-27%. 
     
     
       17. An aluminosilicate glass substrate exhibiting a strain point higher than 640° C., a weight loss less than 2.5 mg/cm 2  after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95° C., a CTE between 31 and 57×10 −7 /°C., nominally free of alkali metal oxides and having a composition consisting essentially of, as calculated in percent by weight on an oxide basis, 49-67% SiO 2 , at least 6% Al 2 O 3 , the Al 2 O 3  being 6-14% in conjunction with 55-67% SiO 2  and 16-23% in conjunction with 49- 58% SiO 2 , SiO 2 +Al 2 O 3 >68%, 0 to less than 8% B 2 O 3 , at least one alkaline earth metal oxide selected from the group consisting of, in the proportions indicated, 0-21% BaO, 0-15% SrO, 0-7.1% CaO, 0-8% MgO and 12-30% BaO+CaO+SrO+MgO. 
     
     
       18. An aluminosilicate glass substrate in accordance with  claim 17  having a CTE in the range of 31-44×10 −7 /°C. and being selected from a group of aluminosilicate sub-families consisting of glasses having compositions consisting essentially of, as calculated in weight percent on an oxide basis; 
       a. 49-58% SiO 2 , 17.5-23% Al 2 O 3 , 0 to less than 8% B 2 O 3 , 0-8% MgO, 0-7.1% CaO, 0.4-13.5% SrO, 0-21% BaO, the glass containing at least one alkaline earth oxide in the indicated proportion and the total BaO+CaO+SrO+MgO content being 13-28%,  
       b. 57-66% SiO 2 , 8-14% Al 2 O 3 , 0 to less than 8% B 2 O 3 , 0-4.5% MgO, 0-7.1% CaO, 0.5-13% SrO, 2-21% BaO.  
     
     
       19. An aluminosilicate glass substrate in accordance with  claim 18  in which the glass has a CTE of 32-40×10 −7 /°C. and the aluminosilicate sub-families consist essentially of: 
       a. 54-57% SiO 2 , 17.5-23% Al 2 O 3 , 5 to less than 8% B 2 O 3 , 2-2.75% MgO, 1.5-<7% CaO, 2-6% SrO and 0.5-9.5% BaO,  
       b. 57-65.5% SiO 2 , 8-13% Al 2 O 3 , 4 to less than 8% B 2 O 3 , 2-3.5% MgO, 0-6.5% CaO, 0-13% SrO and 2-21% BaO.  
     
     
       20. An aluminosilicate glass substrate in accordance with  claim 17  having a CTE in the range of 44-57×10 −7 /°C. and being selected from a group of aluminosilicate sub-families consisting of glasses having compositions consisting essentially of, as calculated in weight percent on an oxide basis: 
       a. 50-57% SiO 2 , 16-22% Al 2 O 3 , 0-5.5% B 2 O 3 , 0.5-3% MgO, 1-7.1% CaO, 0.5-15% SrO, 1-21% BaO,  
       b. 55-67% SiO 2 , 6-14% Al 2 O 3 , 0-7.5% B 2 O 3 , 0-6.5% MgO, 0-7.1% CaO, 0-15.5% SrO, 1-9.5% BaO, the total MgO+CaO+SrO+BaO being 16.5-28%.  
     
     
       21. An aluminosilicate glass substrate in accordance with  claim 20  in which the glass has a CTE in the range of 45-50×10 −7 /°C. and the aluminosilicate sub-families consist essentially of: 
       a. 50-57% SiO 2 , 16-20% Al 2 O 3 , 0-5.5% B 2 O 3 , 2-2.75% MgO, 1-<7% CaO, 0.5-15% SrO and 1-21% BaO,  
       b. 55-67% SiO 2 , 6-<13% Al 2 O 3 , 0-7.5% B 2 O 3 , 2-6.5% MgO, 0-7.1% CaO, 0-14.5% SrO and 2-9.5% BaO.  
     
     
       22. An aluminosilicate glass substrate in accordance with  claim 17  having a strain point greater than 660° C. and a weight loss less than 1 mg/cm 2  after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95° C. and being selected from a group of aluminosilicate sub-families consisting of glasses having compositions consisting essentially of, as calculated in percent by weight on an oxide basis: 
       a. 54-58% SiO 2 , 16-23% Al 2 O 3 , 0-6% B 2 O 3 , 2-4.5% MgO, 1-7.1% CaO, 2.5-15.5% SrO and 0-14.5% BaO, MgO+CaO+SrO+BaO being 15-27%,  
       b. 55-67% SiO 2 , 6-14% Al 2 O 3 , 0-7.5% B 2 O 3 , 0-7% MgO, 0-7.1% CaO, 0-15% SrO, 1-21% BaO, MgO+CaO+SrO+BaO being 18-28%.  
     
     
       23. An aluminosilicate glass substrate in accordance with  claim 17  having a density less than 2.5 grams/cc and a composition consisting essentially of 54.8-57% SiO 2 , 16.8-21.8% Al 2 O 3 , 0 to less than 8% B 2 O 3 , 2.2-2.5% MgO, 1.5-7.1% CaO, 4.5-5.5% SrO, 0.1-14.5% BaO, MgO+CaO+SrO+BaO being 12.5-27%. 
     
     
       24. A method of producing a glass panel for a flat panel display, by a float glass process, which comprises melting a batch for an aluminosilicate glass consisting essentially of, as calculated in percent by weight on an oxide basis,  60  up to  67 %  SiO   2   , at least  6   %  Al   2   O   3   , SiO   2   +Al   2   O   3   > 68   % , B   2   O   3    which is present in an amount of up to  8   % , at least one alkaline earth metal oxide selected from the group consisting of, in the proportions indicated,  0 - 21   %  BaO,  0 - 15   %  SrO,  0 - 7 . 1   %  CaO,  0 - 8   %  MgO and  12 - 30   %  BaO+CaO+SrO+MgO and drawing a thin sheet of molten glass from the melt.   
     
     
       25. A method according to  claim 24 , wherein the aluminosilicate glass composition consists essentially of above  60  up to  67 %  SiO   2   .   
     
     
       26. A method of producing a glass panel for a flat panel display which comprises melting a batch for an aluminosilicate glass consisting essentially of, as calculated in weight percent on an oxide basis, above  60 %  up to  67   %  SiO   2   , at least  6   %  Al   2   O   3   , SiO   2   +Al   2   O   3   > 68   % , B   2   O   3    which is present in an amount of up to  15   % , at least one alkaline earth metal oxide selected from the group consisting of, in the proportions indicated,  0 - 21   %  BaO,  0 - 15   %  SrO,  0 - 7 . 1   %  CaO,  0 - 8   %  MgO and  12 - 30   %  BaO+CaO+SrO+MgO, and drawing a thin sheet of molten glass from the melt by a float process.   
     
     
       27. A method of producing a glass panel for a flat panel display which comprises melting a batch for aluminosilicate glass which is nominally free of alkali metal oxides and has a composition that consists essentially of, as calculated in percent by weight on an oxide basis,  49 - 58 %  SiO   2   ,  17 . 5 - 23   %  Al   2   O   3   ,  0 - 14 . 5   %  B   2   O   3   ,  0 - 8   %  MgO,  0 - 9   %  CaO,  0 . 4 - 13 . 5   %  SrO,  0 - 21   %  BaO, and  13 - 28   %  MgO+CaO+SrO+BaO, and drawing a thin sheet of molten glass from the melt by a float process wherein the glass panel has a strain point higher than  640 ° C., a CTE in the range of  31 - 44 × 10     −7   /° C., and a weight loss less than  2 . 5  mg/cm   2    after immersion for  24  hours in an aqueous  5   %  by weight HCl solution at  95 ° C.   
     
     
       28. The method according to  claim 27 , wherein the CTE is in the range of  32 - 40 × 10   −7   /° C.   
     
     
       29. The method according to  claim 27 , wherein the glass panel has a CTE in the range of  32 - 40 × 10   −7   /° C. and the glass has a composition consisting essentially of, as calculated in percent by weight on an oxide basis,  54 - 57   %  SiO   2   ,  17 . 5 - 23   %  Al   2   O   3   ,  5  to less than  8   %  B   2   O   3   ,  2 - 2 . 75   %  MgO,  1 . 5 -< 7   %  CaO,  2 - 6   %  SrO, and  0 . 5 - 9 . 5   %  BaO.   
     
     
       30. A glass panel produced by the method of  claim 27 . 
     
     
       31. A flat panel display comprising an aluminosilicate glass panel that exhibits a strain point higher than  640 ° C., a weight loss less than  2 . 5  mg/cm 2    after immersion for  24  hours in an aqueous  5   %  by weight HCl solution at  95 ° C., a CTE in the range of  31 - 44 × 10     −7   /° C., is nominally free of alkali metal oxides, and has a composition consisting essentially of, as calculated in percent by weight on an oxide basis,  57 - 66   %  SiO   2   ,  8 - 14   %  Al   2   O   3   ,  0  to less than  8   %  B   2   O   3   ,  0 - 4 . 5   %  MgO,  0 - 7 . 1   %  CaO,  0 . 5 - 13   %  SrO, and  2 - 21   %  BaO.   
     
     
       32. A flat panel display comprising an aluminosilicate glass panel that exhibits a strain point higher than  640 ° C., a weight loss less than  2 . 5  mg/cm 2    after immersion for  24  hours in an aqueous  5   %  by weight HCl solution at  95 ° C., a CTE in the range of  32 - 40 × 10     −7   /° C., is nominally free of alkali metal oxides, and has a composition consisting essentially of, as calculated in percent by weight on an oxide basis, either:    
         a.  54 - 57   %  SiO   2   ,  17 . 5 - 23   %  Al   2   O   3   ,  5  to less than  8   %  B   2   O   3   ,  2 - 2 . 75   %  MgO,  1 . 5 -< 7 . 1   %  CaO,  2 - 6   %  SrO, and  0 . 5 - 9 . 5   %  BaO or    
         b.  57 - 65 . 5   %  SiO   2   ,  8 - 13   %  Al   2   O   3   ,  4  to less than  8   %  B   2   O   3   ,  2 - 3 . 5   %  MgO,  0 - 6 . 5   %  CaO,  0 - 13   %  SrO, and  2 - 21   %  BaO.   
     
     
       33. A flat panel display comprising an aluminosilicate glass panel that exhibits a strain point higher than  640 ° C., a weight loss less than  2 . 5  mg/cm 2    after immersion for  24  hours in an aqueous  5   %  by weight HCl solution at  95 ° C., a CTE in the range of  44 - 57 × 10     −7   /° C., is nominally free of alkali metal oxides and has a composition consisting essentially of, as calculated in percent by weight on an oxide basis, either:    
         a.  50 - 57   %  SiO   2   ,  16 - 22   %  Al   2   O   3   ,  0 - 5 . 5   %  B   2   O   3   ,  0 . 5 - 3   %  MgO,  1 - 7 . 1   %  CaO,  0 . 5 - 15   %  SrO, and  1 - 21   %  BaO or    
         b.  55 - 67   %  SiO   2   ,  6 - 14   %  Al   2   O   3   ,  0 - 7 . 5   %  B   2   O   3   ,  0 - 6 . 5   %  MgO,  0 - 7 . 1   %  CaO,  0 - 15 . 5   %  SrO,  1 - 9 . 5   %  BaO, and MgO+CaO+SrO+BaO being  16 . 5 - 28   %. 
     
     
       34. A flat panel display comprising an aluminosilicate glass panel that exhibits a strain point higher than  640 ° C., a weight loss less than  2 . 5  mg/cm 2    after immersion for  24  hours in an aqueous  5   %  by weight HCl solution at  95 ° C., a CTE in the range of  45 - 50 × 10     −7   /° C., is nominally free of alkali metal oxides and has a composition consisting essentially of, as calculated in percent by weight on an oxide basis, either:    
         a.  50 - 57   %  SiO   2   ,  16 - 20   %  Al   2   O   3   ,  0 - 5 . 5   %  B   2   O   3   ,  2 - 2 . 75   %  MgO,  1 -< 7   %  CaO,  0 . 5 - 15   %  SrO, and  1 - 21   %  BaO or    
         b.  55 - 67   %  SiO   2   ,  6 -< 13   %  Al   2   O   3   ,  0 - 7 . 5   %  B   2   O   3   ,  2 - 6 . 5   %  MgO,  0 - 7 . 1   %  CaO,  0 - 14 . 5   %  SrO, and  2 - 9 . 5   %  BaO.   
     
     
       35. A flat panel display comprising an aluminosilicate glass panel that exhibits a strain point higher than  660 ° C., a weight loss less than  1  mg/cm 2    after immersion for  24  hours in an aqueous  5   %  by weight HCl solution at  95 ° C., a CTE in the range of  31 - 57 × 10     −7   /° C., is nominally free of alkali metal oxides and has a composition consisting essentially of, as calculated in percent by weight on an oxide basis, either:    
         a.  54 - 58   %  SiO   2   ,  16 - 23   %  Al   2   O   3   ,  0 - 6   %  B   2   O   3   ,  2 - 4 . 5   %  MgO,  1 - 7 . 1   %  CaO,  2 . 5 - 15 . 5   %  SrO, and  0 - 14 . 5   %  BaO, MgO+CaO+SrO+BaO being  15 - 27   %  or    
         b.  55 - 67   %  SiO   2   ,  6 - 14   %  Al   2   O   3   ,  0 - 7 . 5   %  B   2   O   3   ,  0 - 7   %  MgO,  0 - 7 . 1   %  CaO,  0 - 15   %  SrO,  1 - 21   %  BaO, and MgO+CaO+SrO+BaO being  18 - 28   %. 
     
     
       36. A flat panel display comprising an aluminosilicate glass panel that exhibits a strain point higher than  640 ° C., a weight loss less than  2 . 5  mg/cm 2    after immersion for  24  hours in an aqueous  5   %  by weight HCl solution at  95 ° C., a CTE in the range of  31 - 57 × 10     −7   /° C., is nominally free of alkali metal oxides, has a density less than  2 . 5  grams/cc, and a composition consisting essentially of, as calculated in percent by weight on an oxide basis,  54 . 8 - 57   %  SiO   2   ,  16 . 8 - 21 . 8   %  Al   2   O   3   ,  0  to less than  8   %  B   2   O   3   ,  2 . 2 - 2 . 5   %  MgO,  1 . 5 - 7 . 1   %  CaO,  4 . 5 - 5 . 5   %  SrO,  0 . 1 - 14 . 5   %  BaO, and MgO+CaO+SrO+BaO being  12 . 5 - 27   %. 
     
     
       37. An aluminosilicate glass that exhibits a strain point higher than  640 ° C., a weight loss less than  2 . 5  mg/cm 2    after immersion for  24  hours in an aqueous  5   %  by weight HCl solution at  95 ° C., a CTE in the range of  31 - 44 × 10     −7   /° C., is nominally free of alkali metal oxides, and has a composition consisting essentially of, as calculated in percent by weight on an oxide basis,  57 - 66   %  SiO   2   ,  8 - 14   %  Al   2   O   3   ,  0  to less than  8   %  B   2   O   3   ,  0 - 4 . 5   %  MgO,  0 - 7 . 1   %  CaO,  0 . 5 - 13   %  SrO, and  2 - 21   %  BaO.   
     
     
       38. An aluminosilicate glass that exhibits a strain point higher than  640 ° C., a weight loss less than  2 . 5  mg/cm 2    after immersion for  24  hours in an aqueous  5   %  by weight HCl solution at  95 ° C., a CTE in the range of  32 - 40 × 10     −7   /° C., is nominally free of alkali metal oxides, and has a composition consisting essentially of, as calculated in percent by weight on an oxide basis, either:    
         a.  54 - 57   %  SiO   2   ,  17 . 5 - 23   %  Al   2   O   3   ,  5  to less than  8   %  B   2   O   3   ,  2 - 2 . 75   %  MgO,  1 . 5 -< 7   %  CaO,  2 - 6   %  SrO, and  0 . 5 - 9 . 5   %  BaO or    
         b.  57 - 65 . 5   %  SiO   2   ,  8 - 13   %  Al   2   O   3   ,  4  to less than  8   %  B   2   O   3   ,  2 - 3 . 5   %  MgO,  0 - 6 . 5   %  CaO,  0 - 13   %  SrO, and  2 - 21   %  BaO.   
     
     
       39. An aluminosilicate glass that exhibits a strain point higher than  640 ° C., a weight loss less than  2 . 5  mg/cm 2    after immersion for  24  hours in an aqueous  5   %  by weight HCl solution at  95 ° C., a CTE in the range of  44 - 57 × 10     −7   /° C., is nominally free of alkali metal oxides, and has a composition consisting essentially of, as calculated in percent by weight on an oxide basis, either:    
         a.  50 - 57   %  SiO   2   ,  16 - 22   %  Al   2   O   3   ,  0 - 5 . 5   %  B   2   O   3   ,  0 . 5 - 3   %  MgO,  1 - 7 . 1   %  CaO,  0 . 5 - 15   %  SrO, and  1 - 21   %  BaO or    
         b.  55 - 67   %  SiO   2   ,  6 - 14   %  Al   2   O   3   ,  0 - 7 . 5   %  B   2   O   3   ,  0 - 6 . 5   %  MgO,  0 - 7 . 1   %  CaO,  0 - 15 . 5   %  SrO,  1 - 9 . 5   %  BaO, and the total MgO+CaO+SrO+BaO being  16 . 5 - 28   %. 
     
     
       40. An aluminosilicate glass that exhibits a strain point higher than  640 ° C., a weight loss less than  2 . 5  mg/cm 2    after immersion for  24  hours in an aqueous  5   %  by weight HCl solution at  95 ° C., a CTE in the range of  45 - 50 × 10     −7   /° C., is nominally free of alkali metal oxides, and has a composition consisting essentially of, as calculated in percent by weight on an oxide basis, either:    
         a.  50 - 57   %  SiO   2   ,  16 - 20   %  Al   2   O   3   ,  0 - 5 . 5   %  B   2   O   3   ,  2 - 2 . 75   %  MgO,  1 -< 7   %  CaO,  0 . 5 - 15   %  SrO, and  1 - 21   %  BaO or    
         b.  55 - 67   %  SiO   2   ,  6 -< 13   %  Al   2   O   3   ,  0 - 7 . 5   %  B   2   O   3   ,  2 - 6 . 5   %  MgO,  0 - 7 . 1   %  CaO,  0 - 14 . 5   %  SrO, and  2 - 9 . 5   %  BaO.   
     
     
       41. An aluminosilicate glass that exhibits a strain point higher than  660 ° C., a weight loss less than  1  mg/cm 2    after immersion for  24  hours in an aqueous  5   %  by weight HCl solution at  95 ° C., a CTE in the range of  31 - 57 × 10     −7   /° C., is nominally free of alkali metal oxides and has a composition consisting essentially of, as calculated in percent by weight on an oxide basis, either:    
         a.  54 - 58   %  SiO   2   ,  16 - 23   %  Al   2   O   3   ,  0 - 6   %  B   2   O   3   ,  2 - 4 . 5   %  MgO,  1 - 7 . 1   %  CaO,  2 . 5 - 15 . 5   %  SrO,  0 - 14 . 5   %  BaO, and MgO+CaO+SrO+BaO being  15 - 27   %  or    
         b.  55 - 67   %  SiO   2   ,  6 - 14   %  Al   2   O   3   ,  0 - 7 . 5   %  B   2   O   3   ,  0 - 7   %  MgO,  0 - 7 . 1   %  CaO,  0 - 15   %  SrO,  1 - 21   %  BaO, and MgO+CaO+SrO+BaO being  18 - 28   %. 
     
     
       42. An aluminosilicate glass that exhibits a strain point higher than  640 ° C., a weight loss less than  2 . 5  mg/cm 2    after immersion for  24  hours in an aqueous  5   %  by weight HCl solution at  95 ° C., a CTE in the range of  31 - 57 × 10     −7   /° C., is nominally free of alkali metal oxides, has a density less than  2 . 5  grams/cc, and a composition consisting essentially of, as calculated in percent by weight on an oxide basis,  54 . 8 - 57   %  SiO   2   ,  16 . 8 - 21 . 8   %  Al   2   O   3   ,  0  to less than  8   %  B   2   O   3   ,  2 . 2 - 2 . 5   %  MgO,  1 . 5 - 7 . 1   %  CaO,  4 . 5 - 5 . 5   %  SrO,  0 . 1 - 14 . 5   %  BaO, and MgO+CaO+SrO+BaO being  12 . 5 - 27   %. 
     
     
       43. An aluminosilicate glass that exhibits a strain point higher than  640 ° C., a weight loss less than  2 . 5  mg/cm 2    after immersion for  24  hours in an aqueous  5   %  by weight HCl solution at  95 ° C., a CTE in the range of  31 - 44 × 10     −7   /° C., is nominally free of alkali metal oxides, and has a composition consisting essentially of, as calculated in percent by weight on an oxide basis,  57 - 66   %  SiO   2   ,  8 - 14   %  Al   2   O   3   ,  0  to less than  8   %  B   2   O   3   ,  0 - 4 . 5   %  MgO,  0 - 7 . 1   %  CaO,  0 . 5 - 13   %  SrO, and  2 - 21   %  BaO.   
     
     
       44. A aluminosilicate glass that exhibits a strain point higher than  640 ° C., a weight loss less than  2 . 5  mg/cm 2    after immersion for  24  hours in an aqueous  5   %  by weight HCl solution at  95 ° C., a CTE in the range of  32 - 40 × 10     −7   /° C., is nominally free of alkali metal oxides, and has a composition consisting essentially of, as calculated in percent by weight on an oxide basis, either:    
         a.  54 - 57   %  SiO   2   ,  17 . 5 - 23   %  Al   2   O   3   ,  5  to less than  8   %  B   2   O   3   ,  2 - 2 . 75   %  MgO,  1 . 5 -< 7   %  CaO,  2 - 6   %  SrO, and  0 . 5 - 9 . 5   %  BaO or    
         b.  57 - 65 . 5   %  SiO   2   ,  8 - 13   %  Al   2   O   3   ,  4  to less than  8   %  B   2   O   3   ,  2 - 3 . 5   %  MgO,  0 - 6 . 5   %  CaO,  0 - 13   %  SrO, and  2 - 21   %  BaO.   
     
     
       45. An aluminosilicate glass that exhibits a strain point higher than  640 ° C., a weight loss less than  2 . 5  mg/cm 2    after immersion for  24  hours in an aqueous  5   %  by weight HCl solution at  95 ° C., a CTE in the range of  44 - 57 × 10     −7   /° C., is nominally free of alkali metal oxides, and has a composition consisting essentially of, as calculated in percent by weight on an oxide basis, either:    
         a.  50 - 57   %  SiO   2   ,  16 - 22   %  Al   2   O   3   ,  0 - 5 . 5   %  B   2   O   3   ,  0 . 5 - 3   %  MgO,  1 - 7 . 1   %  CaO,  0 . 5 - 15   %  SrO, and  1 - 21   %  BaO or    
         b.  55 - 67   %  SiO   2   ,  6 - 14   %  Al   2   O   3   ,  0 - 7 . 5   %  B   2   O   3   ,  0 - 6 . 5   %  MgO,  0 - 7 . 1   %  CaO,  0 - 15 . 5   %  SrO,  1 - 9 . 5   %  BaO, and the total MgO+CaO+SrO+BaO being  16 . 5 - 28   %. 
     
     
       46. An aluminosilicate glass that exhibits a strain point higher than  640 ° C., a weight loss less than  2 . 5  mg/cm 2    after immersion for  24  hours in an aqueous  5   %  by weight HCl solution at  95 ° C., a CTE in the range of  45 - 50 × 10     −7   /° C., is nominally free of alkali metal oxides, and has a composition consisting essentially of, as calculated in percent by weight on an oxide basis, either:    
         a.  50 - 57   %  SiO   2   ,  16 - 20   %  Al   2   O   3   ,  0 - 5 . 5   %  B   2   O   3   ,  2 - 2 . 75   %  MgO,  1 -< 7   %  CaO,  0 . 5 - 15   %  SrO, and  1 - 21   %  BaO or    
         b.  55 - 67   %  SiO   2   ,  6 -< 13   %  Al   2   O   3   ,  0 - 7 . 5   %  B   2   O   3   ,  2 - 6 . 5   %  MgO,  0 - 7 . 1   %  CaO,  0 - 14 . 5   %  SrO, and  2 - 9 . 5   %  BaO.   
     
     
       47. An aluminosilicate glass panel that exhibits a strain point higher than  660 ° C., a weight loss less than  1  mg/cm 2    after immersion for  24  hours in an aqueous  5   %  by weight HCl solution at  95 ° C., a CTE in the range of  31 - 57 × 10     −7   /° C., is nominally free of alkali metal oxides and has a composition consisting essentially of, as calculated in percent by weight on an oxide basis, either:    
         a.  54 - 58   %  SiO   2   ,  16 - 23   %  Al   2   O   3   ,  0 - 6   %  B   2   O   3   ,  2 - 4 . 5   %  MgO,  1 - 7 . 1   %  CaO,  2 . 5 - 15 . 5   %  SrO,  0 - 14 . 5   %  BaO, and MgO+CaO+SrO+BaO being  15 - 27   %  or    
         b.  55 - 67   %  SiO   2   ,  6 - 14   %  Al   2   O   3   ,  0 - 7 . 5   %  B   2   O   3   ,  0 - 7   %  MgO,  0 - 7 . 1   %  CaO,  0 - 15   %  SrO,  1 - 21   %  BaO, and MgO+CaO+SrO+BaO being  18 - 28   %. 
     
     
       48. An aluminosilicate glass panel that exhibits a strain point higher than  640 ° C., a weight loss less than  2 . 5  mg/cm 2    after immersion for  24  hours in an aqueous  5   %  by weight HCl solution at  95 ° C., a CTE in the range of  31 - 57 × 10     −7   /° C., is nominally free of alkali metal oxides, has a density less than  2 . 5  grams/cc, and a composition consisting essentially of, as calculated in percent by weight on an oxide basis,  54 . 8 - 57   %  SiO   2   ,  16 . 8 - 21 . 8   %  Al   2   O   3   ,  0  to less than  8   %  B   2   O   3   ,  2 . 2 - 2 . 5   %  MgO,  1 . 5 - 7 . 1   %  CaO,  4 . 5 - 5 . 5   %  SrO,  0 . 1 - 14 . 5   %  BaO, and MgO+CaO+SrO+BaO being  12 . 5 - 27   %.