Patent ID: 7803472
Filing Date: 2010-09-28
Classification: C03C,G11B,Y10T

Abstract:
1. A substrate glass for data storage medium, comprising as represented by mass %: from 47 to 60% of SiO from 8 to 20% of Al from 0 to 8% of MgO; from 2.0 to 6% of CaO; from 1 to 18% of SrO; from 0 to 13% of BaO; from 2.8 to 6% of TiO from 1 to 5% of ZrO from 2 to 8% of Na from 1 to 15% of K wherein a glass transition temperature of the substrate glass is at least 680° C., and a mol % of SiO