PROBLEM TO BE SOLVED: To provide a borosilicate glass for medical containers, which does not contain BaO, while having good chemical durability and good hydrolysis resistance.SOLUTION: This borosilicate glass for medical containers is characterized by containing, in mol%, 70-80% of SiO2, 1-7% of Al2O3, 8.5-12% of B2O3, 4-9% of Na2O, more than 0% to 5% of K2O, 0-0.1% of Li2O and 0-2% of CaO, while containing substantially no BaO and having a CaO/K2O value of 1.2 or less in terms of a molar ratio.SELECTED DRAWING: NoneCOPYRIGHT: (C)2018,JPO&INPIT【課題】BaOを含有しないガラスであって、化学的耐久性や加水分解抵抗性が良好である医薬容器用ホウケイ酸ガラスを提供する。【解決手段】モル%で、SiO2 70~80%、Al2O3 1~7%、B2O3 8.5~12%、Na2O 4~9%、K2O 0超~5%、Li2O 0~0.1%、CaO 0~2%含有し、BaOを実質的に含まず、CaO/K2Oの値が、モル比で1.2以下であることを特徴とする。【選択図】なし
