PROBLEM TO BE SOLVED: To provide a glass in which transparency is high before radiation irradiation, and coloration is hardly caused even after radiation irradiation, and further that is suitable for a medical container.SOLUTION: A borosilicate glass includes, as a glass composition, and by mass% in terms of following oxides, SiO2 65-78% B2O3 8-18%, Li2O+Na2O+K2O 1-18%, CeO2 0.1-5.0%, and SnO2 0.1-2.0%, and preferably includes SiO2 65-75%, B2O3 8-18%, Li2O+Na2O+K2O 1-10%, CeO2 0.1-5.0%, SnO2 0.1-2.0%, Al2O3 0-10%, CaO 0-7%, BaO 0-5%, Li2O 0-5%, Na2O 0-10%, and K2O 0-5%.COPYRIGHT: (C)2014,JPO&INPIT【課題】放射線照射前において透明性が高く、尚且つ放射線を照射後も着色し難く、さらに医療用容器に適したガラスを提供する。【解決手段】本発明のホウケイ酸ガラスは、ガラス組成として下記酸化物換算の質量%で、SiO2 65~78%、B2O3 8~18%、Li2O+Na2O+K2O 1~18%、CeO2 0.1~5.0%、SnO2 0.1~2.0%を含有し、好ましくはSiO2 65~75%、B2O3 8~18%、Li2O+Na2O+K2O 1~10%、CeO2 0.1~5.0%、SnO2 0.1~2.0%、Al2O3 0~10%、CaO 0~7%、BaO 0~5%、Li2O 0~5%、Na2O 0~10%、K2O 0~5%を含有する。【選択図】なし
