NOVELTY - Producing chemically tempered glass involves chemically tempering a glass containing silica (SiO2) (60-75 mol.%), alumina (Al2O3) (5-15 mol.%), magnesium oxide (MgO) (1-12 mol.%), calcium oxide (CaO) (0-3 mol.%), zirconium oxide (ZrO2) (0-3 mol.%), lithium oxide (Li2O) (10-20 mol.%), sodium oxide (Na2O) (0-8 mol.%) and potassium oxide (K2O) (0-5 mol.%), where the glass has a total content Li2O, Na2O and K2O of at most 25%, and ratio of Li2O/Li2O+Na2O+K2O is 0.5-1.    USE - For producing chemically tempered glass, which is used in glass plate, display device, touch panel, portable device (claimed), solar cell substrate or window glass for aircrafts.    ADVANTAGE - The method provides glass without having boron trioxide (B2O3); and provides chemically tempered glass which acquires sufficient strength even by chemical tempering at a low temperature for a short time.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) glass (G1) comprising (mol.%): SiO2 (60-75), Al2O3 (5-15), MgO (7-12), CaO (0-3), ZrO2 (0-3), Li2O (10-20), Na2O (0-8) and K2O (0-5), and has a total content of Li2O, Na2O and K2O of at most 25%, and ratio Li2O/Li2O+Na2O+K2O of 0.5-1;    (2) glass (G2) comprising (mol.%): SiO2 (66-75), Al2O3 (5-8), MgO (1-12), CaO (0-3), ZrO2 (0-3), Li2O (10-20), Na2O (0-6) and K2O (0-5), and has a total content of Li2O, Na2O and K2O of at most 25%, and ratio of Li2O/Li2O+Na2O+K2O of 0.6-1;    (3) a glass plate for chemical tempering, which is made of the glass (G1);    (4) a chemically tempered glass plate obtained by subjecting the glass plate to chemical tempering treatment;    (5) producing a chemically tempered glass plate involving carrying out chemical tempering treatment by immersing the glass plate for chemical tempering in a molten salt, where the molten salt contains at least one of sodium nitride (NaNO3) and potassium nitride (KNO3), and the chemical tempering treatment is carried out at a temperature of the molten salt being at most 425 degrees C for an immersion time of at most 2 hours;    (6) a display device provided with the chemically tempered glass plate;    (7) a touch panel provided with the chemically tempered glass plate;    (8) a portable device provided with the chemically tempered glass plate; and    (9) producing a display device, touch panel, portable device provided with a chemically tempered glass plate involving producing the chemically tempered glass plate by the method for producing chemically tempered glass.