Patent ID: 11787731

Abstract:
A glass composition includes: greater than or equal to 53 mol % and less than or equal to 70 mol % SiO2; greater than or equal to 9 mol % and less than or equal to 20 mol % Al2O3; greater than or equal to 10 mol % and less than or equal to 17.5 mol % B2O3; greater than or equal to 0 mol % Li2O; greater than or equal to 0 mol % Na2O; and greater than 0.1 mol % of a nucleating agent. The sum of Li2O and Na2O in the glass composition may be greater than or equal to 8 mol % and less than or equal to 30 mol %. The amount of Al2O3 minus the sum of R2O and RO in the glass composition may be greater than or equal to −3 mol %. The glass composition may be phase separable and may have an improved KIc fracture toughness.