Patent ID: 7153799

Claim:
A glass composition comprising: SiO 2 57 to 58.2 percent by weight; Al 2 O 3 12 to 13.7 percent by weight; CaO 23.5 to 24.5 percent by weight; MgO 2 to 3 percent by weight; TiO 2 0.5 to 2 percent by weight; Na 2 O 0 to 1 percent by weight; Li 2 O 0 to less than 0.1 percent by weight; Na 2 O + K 2 O + Li 2 O 0 to 1 percent by weight; Fe 2 O 3 0.05 to 0.4 percent by weight; B 2 O 3 0 to 0.05 percent by weight; fluorine no greater than 0.30 percent by weight; wherein the glass composition has a log 3 forming temperature no greater than 1240° C., and the difference between the log 3 forming temperature and the liquidus temperature is at least 50° C.