Patent ID: 7612004

Claim:
A substrate for a flat panel display device comprising a rare earth aluminosilicate glass exhibiting a strain point greater than approximately 650° C., a liquidus temperature less than approximately 1300° C., the glass comprising the following composition when calculated in mole percent and calculated from the batch on an oxide basis: 60-75%SiO 2 10.6-20% Al 2 O 3 2-15%RE 2 O 3 the RE being a rare earth selected from group consisting of Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and mixtures thereof; and 1-12% of one or more RO, wherein R is an alkaline earth metal selected from the group consisting of Mg, Ca, Sr, or any combination thereof; or when R is Ba, at least one additional alkaline earth metal selected from the group consisting of Mg, Ca, and Sr is present; 0-9% B 2 O 3 ; and 0-2% SnO 2 , wherein the composition does not contain TiO 2 and Ta 2 O 5 either individually or in any combination thereof.