GLASS COMPOSITIONS WITH IMPROVED CHEMICAL AND MECHANICAL DURABILITY

摘要

A glass composition comprising: from about 70 mol.% to about 80 mol.% SiO2; from about 4 mol.% to about 8 mol.% alkaline earth oxide, the alkaline earth oxide comprising CaO and from about 3 mol.% to about 7 mol.% MgO; X mol.% A120 3 , wherein X is from about 5 to about 7; and Y mol.% alkali oxide, wherein the alkali oxide comprises Na20 in an amount greater than 8 mol.%, and the glass composition is free of boron and compounds of boron.