Patent ID: 8828897

Claim:
An alumino-silicate glass, comprising: one of a following plurality of glass compositions (in weight % on an oxide basis): SiO 2 49-<59 weight % B 2 O 3 0 weight % Al 2 O 3 >5-15 weight % Li 2 O 0-<0.3 weight % Na 2 O >10-18 weight % K 2 O >0-<5 weight %, wherein the sum Li 2 O + Na 2 O + K 2 O is >10-19 weight %, and MgO 0-6 weight % CaO 5-<12 weight % SrO 0 weight % BaO >1-<3.5 weight % wherein the sum MgO + CaO + SrO + BaO is 5-19 weight %, and F 0-3 weight % TiO 2 >0.1-10 weight % Fe 2 O 3 0-0.5 weight % ZrO 2 >0.5-9 weight % CeO 2 0-3 weight % WO 3 0-3 weight % Bi 2 O 3 0-3 weight % MoO 3 0-3 weight %. wherein the alumino-silicate glass is selected so that a quotient (weight %) of Na 2 O/(MgO+CaO+ZrO 2 ) is in a range of 0.5 to 0.9.