Corning Incorporated
Glasses with low excess modifier content

Abstract:

A glass composition includes: from 55.0 mol % to 70.0 mol % SiO.sub.2; from 12.0 mol % to 20.0 mol % Al.sub.2O.sub.3; from 5.0 mol % to 15.0 mol % Li.sub.2O; and from 4.0 mol % to 15.0 mol % Na.sub.2O. The glass composition has the following relationships -8.00 mol %.ltoreq.R.sub.2O+RO--Al.sub.2O.sub.3--B.sub.2O.sub.3--P.sub.2O.sub.5.lto- req.-1.75 mol %, 9.00.ltoreq.(SiO.sub.2+Al.sub.2O.sub.3+Li.sub.2O)/Na.sub.2O, and (Li.sub.2O+Al.sub.2O.sub.3+P.sub.2O.sub.5)/(Na.sub.2O+B.sub.2O.sub.3).lto- req.3.50. The glass composition may be used in a glass article or a consumer electronic product.