AR                            CP

项目                                                 USP级级                                                 (USP28)
外观Appearance                                                               白色或类白色粉末
有机挥发杂质Organic volatile matter                                   符合规定
重金属Heavy metals                                                          ≤0.0005%
酒精不溶物Insoluble matter in alcohol                                 符合要求
硬脂酸stearic acid                                                             ≥40.0%
硬脂酸和棕榈酸相对含量stearic and palmitic acid                  ≥90.0%
脂肪酸的酸值Acid value                                                     196~211
脂肪酸的碘值Iodine value                                                  ≤4.0%
酸度（硬脂酸计）Free acid (as stearic acid)                         0.28%~1.2%
干燥失重Loss on drying                                                     ≤5.0%(105°C) (1.5 小时)