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1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP)CAS No. 2809-21-4                          Molecular formula: C2H8O7P2                               Molecular weight: 206.02 Structural formula   Properties HEDP is an organophosphoric acid corrosion inhibitor. It can chelate with Fe, Cu, and Zn ions to form stable chelating compounds. It can dissolve the oxidized materials on these metals’ surfaces. HEDP shows excellent scale and corrosion inhibition effects under temperature 250?. HEDP has good chemical stability under high pH value, hard to be hydrolyzed, and hard to be decomposed under ord