Glass composition for strengthened cover glass

摘要

The present invention discloses a cover glass and a glass composition, wherein said glass composition comprises: SiO2 from about 5 70.5 to about 77.0 mole %; A120 3 from about 8.5 to about 12.5 mole %; Na 2O from about 10.6 to 14.6 mole %; K2 0 from about 1.1 to about 5.1 mole %; B2 0 3 from about 0 to 3 mole %; MgO from about 2.8 to about 5.8 mole %; CaO from about 0 to 3.7 mole %; and TiO2 from about 0 to 0.7 mole %; wherein inclusion of silica from about 70.5 to 77.0 mole % 10 decreases the overall density of the cover glass, wherein the density is in the range from about 2.3 to about 2.45 g/cm 3 . The glass is ion exchangeable at relatively low temperatures to a depth of at least 20 pm.