Patent ID: 8431500

Claim:
A space glass with a composition, in percent by weight based on oxide content, comprising: SiO 2 5-65 B 2 O 3 0-40 Al 2 O 3 0-12 PbO 25-50 Na 2 O 0-8 K 2 O 0-20, Σ alkali metal oxides, at least 0.25; and at least three doping agents selected from the group consisting of CeO 2 , MoO 3 , Bi 2 O 3 , WO 3 , Ag 2 O, SnO 2 , Sb 2 O 3 and As 2 O 3 ; wherein a total amount of said at least three doping agents in said composition is at least 0.1 percent by weight; wherein the glass contains at least one of said doping agents selected from the group consisting of CeO 2 , As 2 O 3 , Sb 2 O 3 and SnO 2 ; and wherein the glass contains at most 1 wt. % of CeO 2 when CeO 2 is present in the glass, at most 0.02 wt. % of As 2 O 3 when As 2 O 3 is present in the glass, at most 0.3 wt. % of Sb 2 O 3 when Sb 2 O 3 is present in the glass; and at most 0.5 wt. % of SnO 2 when SnO 2 is present in the glass.