铥5000000元/kgCas号7440-30-4分子式Tm分子量168.93别名铥粉外观Appearancedarkgreyfoil痕量分析TraceanalysisofICP≤2000ppm（rareearthimpurities)ICPAssayConfirmsthuliumcomponent纯度Puritybasedonrareearthanalysis≥99.9%)