Corning Incorporated
TUNABLE GLASS COMPOSITIONS HAVING IMPROVED MECHANICAL DURABILITY

Abstract:

A glass composition includes: greater than or equal to 24 mol % and less than or equal to 60 mol % SiO.sub.2; greater than or equal to 23 mol % and less than or equal to 35 mol % Al.sub.2O.sub.3; greater than or equal to 3.5 mol % and less than or equal to 35 mol % B.sub.2O.sub.3; greater than 0 mol % and less than or equal to 20 mol % Li.sub.2O; greater than or equal to 0 mol % and less than or equal to 10 mol % Na.sub.2O; and greater than or equal to 0 mol % and less than or equal to 3 mol % K.sub.2O. The sum of Li.sub.2O, Na.sub.2O, and K.sub.2O (i.e., R.sub.2O) in the glass composition may be greater than or equal to 12 mol % and less than or equal to 20 mol %.