HEDPis anorganophosphoric acid corrosion inhibitor. It can chelate with Fe,Cu, and Zn ions to form stable chelating compounds.It can dissolvethe oxidized materials on these metals`surfaces.HEDPshows excellent scale andcorrosion inhibition effects under temperature250℃.HEDPhas good chemical stabilityunder high pH value, hard to be hydrolyzed, and hard to bedecomposed under ordinary light and heat conditions. Itsacid/alkali and chlorine oxidation tolerance are better than thatof other organophosphoric acids(salt).HEDPcan react with metal ions inwater system to form hexa-element chelating complex, with calciumion in particular. Therefore,HEDPhas goodantiscale and visible threshold effects. When built together withother water treatment chemicals, it shows good synergisticeffects.

The solid stateofHEDPis crystal powder, suitable forusage in winter and freezing districts. Because of its high purity,it can be used as cleaning agent in electronic fields and asadditives in daily chemicals.