... 1,1-Diphosphonic Acid (HEDP) Uses:HEDP is used as scale and corrosion inhibition in circulating cool water system, oil field ... chemical industry, metallurgy, fertilizer, etc.. In light woven industry, HEDP is used as detergent for metal and nonmetal. In dyeing ... polycarboxylic acid 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP) Molecular FormulaC2H8O7P2CAS No.2809-21-4Appearance Colorless or light ...