Patent ID: 8598056

Claim:
A glass comprising: 67≦SiO 2 ≦70 11≦Al 2 O 3 ≦13.5 3≦B 2 O 3 ≦6 3.5≦MgO≦7 4≦CaO≦7 1≦SrO≦4 0.5≦BaO≦3 0.02≦SnO 2 ≦0.3 0≦CeO 2 ≦0.3 0.00≦As 2 O 3 ≦0.5 0.00≦Sb 2 O 3 ≦0.5 0.01≦Fe 2 O 3 ≦0.08 F+Cl+Br≦0.4 wherein all oxides are in mol % and 1.05≦(MgO+BaO+CaO+SrO)/Al 2 O 3 ≦1.25 0.7≦(CaO+SrO+BaO)/Al 2 O 3 ≦0.9 0.3≦MgO/(CaO+SrO+BaO)≦0.6 where Al 2 O 3 , MgO, CaO, SrO and BaO represent the mol percents of the representative oxide components.