Email :   Phone : +86-411-84820079
PVPK30 for toothpaste supplier
Home » Products » Water Treatment Chemical » Organophosphonic Acid Scale Inhibitor Chelating Agent Etidronate Disodium HEDP Na2 CAS 7414-83-7


Share to:
facebook sharing button
twitter sharing button
line sharing button
wechat sharing button
linkedin sharing button
pinterest sharing button
whatsapp sharing button
sharethis sharing button

Organophosphonic Acid Scale Inhibitor Chelating Agent Etidronate Disodium HEDP Na2 CAS 7414-83-7

HEDP.Na2 is an organophosphonic acid corrosion inhibitor, it can chelate with Fe, Cu, and Zn ions, it can dissolve the oxidized materials, it has good scale and corrosion inhibition effects even under 250℃,it is stable under high pH value, not easy to be hydrolyzed, not easy to be decomposed under normal light and heat condition, its acid/alkaline and chloride oxidation tolerance are better than that of other organophosph- onic acids. HEDP.Na2 can form six-ring chelating compounds with metal ions in water system, Ca2+ in particular. HEDP.Na2 has good scale inhibition effects and obvious dissolution threshold effects. When usedwith other Water Treatment Chemicals, the synergistic effects is better.
  • HEDP Na2 20% 90%

  • Sinobio

  • 29319090

Disodium of 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid(HEDP•Na2)

Name: HEDP
CAS: 2809-21-4
Chemical formula: C2h8o7p2
Appearance: Colorless transparent liquid

Etidronic acid (HEDP) is a new type of chloride free electroplating complexing agent, which is used as the main agent to stabilize the water quality in the circulating cooling water system and plays a role of corrosion and scale inhibition.
This product is one of the organic polyphosphonic acid free water tablets, and there are also other varieties of this type of product produced domestically, such as amino trimethylene phosphonic acid (ATMP): [CH2PO (OH) 2] 3N, and  (EDTMP), etc. Organic polyphosphonic acid is a type of water treatment agent developed in the late 1960s and confirmed around the 1970s. The emergence of this type of treatment agent has taken a significant step forward in water slicing technology. Compared with organic polyphosphates, organic polyphosphonate free acids have the characteristics of chemical stability, difficult hydrolysis, high temperature resistance, small dosage, and scale moderation. It is a type of cathodic corrosion inhibitor and a type of non chemical equivalent scale inhibitor; When used in combination with other water treatment agents, it exhibits ideal synergistic effects. It has excellent chelating properties for many metal ions such as calcium, magnesium, copper, zinc, etc., and even has good deactivation effects on inorganic salts of these metals such as CaSO4, CaCO3, MgSiO3, etc. Therefore, it is widely used in water treatment technology.


Active content(HEDP)%
Active content(HEDP·H2O)%
Ph0sphorous acid(as PO3 3-)%  
Ph0sphoric acid(as PO4 3-)%
PH (1% solution )
Fe ppm
Chloride ppm

Application scope and method of use

HEDP.Na2 is widely used in circulating cool water system, medium and low pressure boiler, oil field water pipelines as scale and corrosion inhibitor in fields such as electric power, chemical industry, metallurgy, fertilizer, etc.. In light woven industry, HEDP.Na2 is used as detergent for metal and nonmetal. In dyeing industry, The dyes the industry fixing agent In non-cyanide electroplating used as chelating agent.

Package and Storage

HEDP.Na2 plastic drum, 25kg or 250kg, or confirmed by clients Storage for ten months in shady room and dry place. 

package   package   package

Safety Protection

HEDP.Na2 Weak acidity, Avoid contact with eye and skin, once contacted, flush with water.


Contact Us

Product Category

If you have any questions, please contact us via email or telephone and we will get back to you as soon as possible.

Quick Links

Product Category

Contact Us

Copyright © 2023 Dalian Sinobio Chemistry Co.,Ltd. All Rights Reserved.  Sitemap | Technology by | Privacy Policy