1-Hydroxyethylidene-1,1-diphosphonic acid, HEDP

Product Overview

Etidronic Acid (common names HEDP, hydroxyethylidene diphosphonic acid, brand Dequest 2010) — CAS 2809-21-4 — is a water-soluble phosphonic acid used as a scale inhibitor, corrosion inhibitor and chelating agent. It forms stable chelates with calcium, iron and copper, dissolves metal oxides and retains activity under high pH and elevated temperatures (effective up to ~250 °C in formulated systems). HEDP is unusually resistant to chlorine oxidation versus many other phosphonates, making it ideal for combined-treatment programs.

HEDP is an organic phosphonic acid scale and corrosion inhibitor that can form stable complexes with various metal ions such as iron, copper, and zinc, and dissolve oxides on metal surfaces. It can still play a good role in corrosion and scale inhibition at 250 ℃, remains stable at high pH, is not easily hydrolyzed, and is generally not easily decomposed under light and heat conditions. The acid, alkali, and chlorine oxidation resistance are better than other organic phosphonic acids (salts). It can form hexagonal chelates with metal ions, especially calcium ions, in water, thus exhibiting good scale inhibition effect and significant solubility limit effect. When used in combination with other water treatment agents, it shows ideal synergistic effect.
HEDP solid belongs to high-purity products and is suitable for harsh winter regions; Specially suitable for cleaning agents and daily chemical additives in the electronics industry.

Key Grades & Typical Specs

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