PROBLEM TO BE SOLVED: To provide a method for storage of a hexagonal boron nitride which is preferable as a raw material of cosmetics and the like, complies with "Japanese Standards of Quasi-drug Ingredients 2006" and gives less eluted boron.SOLUTION: A method for storage of a hexagonal boron nitride is provided. The hexagonal boron nitride has a graphitization index of 3.0 or less as determined by powder X-ray diffractometry and has an eluted boron concentration of 20 ppm or less as measured in accordance with Japanese Standards of Quasi-drug Ingredients 2006. The hexagonal boron nitride is stored in a packaging container under a vacuum state or in a packaging container filled with at least one gas which has a dew point of 0°C or lower and is selected from a rare gas, nitrogen and air.SELECTED DRAWING: NoneCOPYRIGHT: (C)2019,JPO&INPIT【課題】本発明は、化粧料の原料用などとして好適に用いられる、「外原規2006」の規定を満たす、溶出ホウ素の少ない六方晶窒化ホウ素の保管方法を提供することを目的とする。【解決手段】六方晶窒化ホウ素を、粉末X線回折法による黒鉛化指数が3.0以下であり、かつ医薬部外品原料規格2006に準拠して測定される溶出ホウ素濃度が20ppm以下である六方晶窒化ホウ素とし、これを真空状態とした包装容器内、または露点を0℃以下とした希ガス、窒素、空気から選ばれる1種以上のガスが満たされている包装容器内に収納する、六方晶窒化ホウ素の保管方法を提供する。【選択図】なし
