Patent ID: 6376402
Filing Date: 2002-04-23
Classification: C03C

Abstract:
A glass or glass-ceramic having a high specific elasticity modulus with a composition (in % by weight based on oxide content) comprising:SiO225 to 50B2O3>5 to 16Al2O310 to 17P2O50 to 8Li2Oâ€‚5 to 15Na2Oâ€‚0 to 10K2Oâ€‚0 to 10MgO10 to 30CaOâ€‚0 to 10SrO0 to 8ZnO0 to 8TiO20.1 to 10â€‰ZrO20 to 8and at least one refining agent, as needed, in an amount suitable for refining;wherein a sum total amount of divalent metal oxides (RO) present is less than or equal to 45% by weight based on said oxide content and a sum total amount of alkali metal oxides (R2O) present is less than or equal to 30% by weight based on said oxide content.