Patent ID: 7727917

Claim:
A glass, comprising: Ingredient Percent by weight TiO 2 0 to 0.75; SiO 2 63.42 to 74.29; Al 2 O 3 18.26 to 28.51; Li 2 O 4.94 to 7.5; Na 2 O 0.39 to 2.39; K 2 O 0.07 to 0.25; CaO 0 to 1.27; MgO 0 to 2.6; SO 3 0 to 0.19; Total iron as Fe 2 O 3 0.05 to 0.061; MnO 2 0 to 0.02; ZrO 2 0 to 1.5; Total tin as SnO 2 0 to 0.5; TiO 2 0 to 1.89; P 2 O 5 0 to 1.06; ZnO 0 to 0.5; B 2 O 3 0 to 2; NF(Al 2 O 3 + ZrO 2 ) 18.26 to 28.51; RO(CaO + MgO) 0.04 to 2.64; R 2 O(Na 2 O + K 2 O) 0.49 to 2.49; and wherein the glass has the following properties: (a) a log 10 viscosity temperature of at least 1280° F. (694° C.) and (b) a liquidus temperature of at least 2350° F. (1288° C.).