Patent ID: 6387510
Filing Date: 2002-05-14
Classification: C03C,Y10T

Abstract:
A glass for a data storage medium substrate, consisting essentially of the following components as represented in mol %:SiO260 to 72,Al2O3â€‚2 to 9MgOâ€‚3 to 9,CaOâ€‚2 to 10,SrOâ€‚0 to 15,ZnOâ€‚0 to 4,TiO2â€‚0 to 8,ZrO2â€‚0 to 4,Li2Oâ€‚1 to 12,Na2Oâ€‚0 to 8,K2Oâ€‚0 to 5,Y2O3â€‚0 to 5,La2O3â€‚0 to 5, andLi2O + Na2O + K2Oâ€‚4 to 15,wherein said glass has a Young's modulus of at least 85 GPa; and wherein (Al2O3â€”Li2O)&lE;2.2 mol %.