NOVELTY - Glass element comprises a molar composition of components comprising: 56-70 mole% silicon dioxide; 10.5-16 mole% aluminum oxide; 2.5-9 mole% boron trioxide; 10-15 mole% sodium oxide; 0-5 mole% potassium oxide; 0-6 mole% magnesium oxide; 0.1-2.1 mole% zirconium dioxide; 0-2.1 mole% titanium dioxide; 0-0.1 mole% cerium oxide; 0-0.3 mole% tin oxide; 0-1.5 mole% phosphorus pentoxide; 0-2 mole% zinc oxide; 0-less than 0.2 mole% lithium oxide; and 0-2 mole%, preferably 0-1 mole% other components, with a content of fluoride of less than 0.2 mole%.    USE - The glass element is useful as: a protective glass for electronic devices with touch functionality, a protective glass for electronic devices without touch functionality, preferably mobile phones, smart-phones, tablet personal computers, personal computers with touch display, navigation devices, monitors, public displays and terminals, and for industrial displays; a high-strength protective glass for surfaces in a household, a high-strength protective glass for surfaces in a road or rail vehicle, aircraft, and watercraft; a glazing of a headlight, a glazing of a lamp; a substrate material for a solar cell and a hard drive; and a laminate of safety glazing (claimed).    ADVANTAGE - The glass: exhibits improved scratch tolerance and compressive stress; and achieves a good balance between not too high softening point and a low devitrification tendency, and a high scratch tolerance and good ion exchangeability.    DETAILED DESCRIPTION - Glass element comprises a molar composition of components comprising: 56-70 mole% silicon dioxide; 10.5-16 mole% aluminum oxide; 2.5-9 mole% boron trioxide; 10-15 mole% sodium oxide; 0-5 mole% potassium oxide; 0-6 mole% magnesium oxide; 0.1-2.1 mole% zirconium dioxide; 0-2.1 mole% titanium dioxide; 0-0.1 mole% cerium oxide; 0-0.3 mole% tin oxide; 0-1.5 mole% phosphorus pentoxide; 0-2 mole% zinc oxide; 0-less than 0.2 mole% lithium oxide; and 0-2 mole%, preferably 0-1 mole% other components, with a content of fluoride of less than 0.2 mole%. The glass has a surface in which sodium ions are exchangeable for potassium ions, at least partly, such that a compressive stress zone is producible at the surface for chemically tempering the glass element. INDEPENDENT CLAIMS are also included for:    (1) producing a chemically tempered glass element, comprising producing the glass element and chemically tempering the glass by storing the glass in a salt bath at a temperature of at least 300 degrees C for a duration of at least 1.5 hours, the salt bath comprising potassium ions such that sodium ions at a surface of the glass are at least partly exchanged for the potassium ions of the salt bath with an exchange depth of alkali ions of at least 25 mu m such that a compressive stress zone is generated at the surface and with a compressive stress at the surface of at least 700 MPa; and    (2) a glass for producing glass element comprising a molar composition of above mentioned components.