Patent ID: 6251812
Filing Date: 2001-06-26
Classification: C03C,Y10T

Abstract:
A glass composition consisting essentially of the following components in terms of mol %:50 to 62% SiO.sub.2,6 to 18% Al.sub.2 O.sub.3,7 to 15% Li.sub.2 O,3 to 12% Na.sub.2 O,0 to 2% K.sub.2 O,0 to 10% TiO.sub.2,0 to 4% ZrO.sub.2,0 to 6% MgO,0 to 9% CaO, and0 to 6% SrO,provided that the content of RO (RO=MgO+CaO+SrO) is from 2 to 15%,wherein the glass composition has undergone an ion exchange treatment in at least one molten salt containing ions of potassium, sodium, or both;and, the glass composition having a rigidity as defined by (Young's modulus)/(specific gravity) of 30 Gpa-cm.sup.3 /g or higher and a modulus of elasticity as represented by Young's modulus of 90 GPa or higher.