1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP)

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 have good corrosion and scale inhibition effects 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.


HEDP is widely used in industrial circulating cooling water systems such as power, chemical, metallurgical, and fertilizer industries, as well as for scale and corrosion inhibition in medium and low pressure boilers, oilfield water injection, and oil pipelines; In the textile industry, it can be used as a cleaning agent for metals and non metals, a peroxide stabilizer and fixing agent for the dyeing industry, a complexing agent for cyanide free electroplating industry, and a carrier for radioactive elements in the pharmaceutical industry.

Molecular formula: C2H8O7P2                     
Relative molecular weight: 206.02
CAS:2809-21-4