Patent ID: 6340647
Filing Date: 2002-01-22
Classification: C03C,G11B,Y10T

Abstract:
A glass composition consisting of the following components in terms of mol %:40 to 55% SiO2, 10 to less than 20% Al2O3, 2 to 10% Li2O, 0 to 5% Na2O, provided that the content of R2O (R2O=Li2O+Na2O) is from 2 to 10%,0 to 10% ZrO2, 5 to 25% MgO, 0 to 25% CaO, and 0 to 6% SrO, provided that the content of RO (RO=MgO+CaO+SrO) is from more than 15 to 30%.