TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Method: In the method, the glass contains SiO2 (at most 73%), Al2O3 (at least 8), MgO (at most 7) and Na2O (at least 1), and has a total content Na2O+K2O of Na2O and K2O of 2.5-10%; the glass contains Al2O3 (at least 9); the glass contains SiO2 (at least 62%) and Al2O3 (9-14%), and has Li2O+Na2O+K2O of at most 22%, Na2O+K2O of 3-8%, and Li2O/Li2O+Na2O+K2O of at least 0.6; the glass contains SiO2 (at least 62%), Al2O3 (less than 9%) and Na2O (at most 6%), and has Li2O/Li2O+Na2O+K2O of at least 0.6; the glass contains SiO2 (at least 66%), Al2O3 (less than 8%) and MgO (at most 7%); the glass has Li2O+Na2O+K2O of at most 20% and Na2O+K2O of 0-6%; the glass for chemical tempering is one, where the difference having Na2O+K2O subtracted from the Li2O content is 4-17.5 (preferably 8-17)%; the chemical tempering of glass is calculated by using equation, as given in the specification by using the contents of the respective components of Al2O3, MgO, ZrO2, Li2O, Na2O and K2O of at least 40 mol.%; and the glass has Li2O/Li2O+Na2O+K2O of more than 0.8. The chemical tempering of the glass for chemical tempering is carried out by immersing the glass in a molten salt containing at least either one of NaNO3 and KNO3 at a temperature of at most 425 degrees C for at most 2 hours. The glass is glass plate, which is produced by a float process or a fusion process. The glass plate is produced by a float process or a fusion process. Preferred Glass: The glass (G1) contains (%): SiO2 (at most 68), Al2O3 (at most 13), Li2O (at most 17), Na2O (0-5) and K2O (0-3), and has Li2O+Na2O+K2O of at most 18%, and Li2O/Li2O+Na2O+K2O of at least 0.7; Al2O3 (less than 9); or Li2O (at least 12). The glass (G2) has Li2O+Na2O+K2O of at most 20%. The glass (G1) has a total content Na2O+K2O of Na2O and K2O of 0-6%. In the glass (G1), the difference having Na2O+K2O subtracted from Li2O content is 8-17. EXAMPLE - A chemically tempered glass was produced by carrying out chemically tempering treatment on glass containing silica (SiO2) (64 mol.%), alumina (Al2O3) (12 mol.%), magnesium oxide (MgO) (2 mol.%), zirconium oxide (ZrO2) (2 mol.%), lithium oxide (Li2O) (12 mol.%), and sodium oxide (Na2O) (8 mol.%), and having a total content of Na2O and K2O of 8, and ratio of Li2O/Li2O+Na2O+K2O of 0.6, by immersing in a sodium nitrite (NaNO3) molten salt at 400 degrees C for one hour. The obtained glass showed glass transition temperature of 542 degrees C, and Young's modulus of 86.1 GPa.