It is difficult for delamination to occur, and after compressing into a final product such as an ampoule, vial, prefilled syringe, cartridge, etc., a compression stress layer of sufficient depth can be imparted to the container by chemical strengthening, We propose glass for pharmaceutical containers and glass tubes using them. mol%, SiO2 69 to 81%, Al2O3 4 to 12%, B2O3 0 to 5%, Li2O + Na2O + K2O 5 to 20%, Li2O 0.1-12%, Na2O 1 to 11%, K2O 1 to 11%, MgO + CaO + SrO + BaO 0 to 10%, and K2O / Na2O 0.3 is satisfied.
