Patent ID: 8623776

Claim:
A silicate glass having a seed concentration of less than about 1 seed/cm 3 , wherein the silicate glass comprises: 60-70 mol % SiO 2 ; 6-14 mol % Al 2 O 3 ; 0-3 mol % B 2 O 3 ; 0-1 mol % Li 2 O; 8-18 mol % Na 2 O; 0-5 mol % K 2 O; 0-2.5 mol % CaO; above 0 to 3 mol % ZrO 2 ; 0-1 mol % SnO 2 ; and 0-1 mol % CeO 2 , wherein 12 mol %<Li 2 O+Na 2 O+K 2 O≦20 mol %, and wherein the silicate glass comprises less than 50 ppm As 2 O 3 .