1-HYDROXYETHY LIDENE -1,1-DIPHOSPHONIC ACID(HEDP) Appearance: clear,water-white to pale yellow solution Active Content (as hedp): 60.00% Phosphorous acid (as PO33-):2.0% max. Phosphoric acid (as PO43-):0.8% max. Chlorides (as Cl-):1.0% max. PH(1% water solution at 25): 1.0-2.0 Iron: 20ppm max. Color : 80 Hazen Max Specific gravity (at 20):1.41-1.46 Ca2+ Sequestration, (as CaCO3 mg/g ): 450 Min Pack:250kg/plastic drum;20mt/FCL Corrosive. avoid contact with eyes and skin.UN No.:3265