HEDP, known as 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid, is an organophosphonic acid compound. It is mainly used as a water quality stabiliser and chelating agent, and is widely used in household and industrial applications.HEDP has the chemical formula C₂H₈O₇P₂ , and belongs to the phosphonate family, which can be further classified as a chelating agent, scale inhibitor, stabiliser and corrosion inhibitor.

hedp chemical structure

The structural formula of the related sodium salt of HEDP, HEDP 2NA, is as follows:

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