haracters: White lyophilized powder Activity: >=3 E.P. U/mg Solubility: Soluble, clear Protein impurities of higher molecular mass: Pass Loss on drying: <=6.0% Abnormal toxicity: Pass Sterility: Pass Pyrogens: Pass Absorbance(3.0U/ml): Pass Histamine: Pass PH: 5.0-7.0