Product Details


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

HEDP•Na2(Disodium Salt of 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid) is a white powder used as a water treatment agent. It helps to prevent scale formation and corrosion in water systems. HEDP•Na2 can be used in various applications, including cooling towers, boilers, process water systems, and more. If you are looking for a reliable and effective water treatment agent, HEDP•Na2 is a perfect choice. China Best Chemical offers high-quality HEDP•Na2 at an affordable price. Contact us today to learn more about our products and services.

Product Description

CAS NO. 7414-83-7

Dequest 2016BD

Molecular Formula: C2H6O7P2Na2

Structural Formula:



HEDP•Na2 is an organophosphorus acid corrosion inhibitor that can chelate with Fe, Cu, and Zn ions, providing excellent scale and corrosion inhibition effects even under temperatures such as 250℃. It demonstrates excellent stability even under elevated pH levels and has good tolerance for acidic/alkaline solutions and chlorine oxidation. It is not easily hydrolyzed or decomposed under normal light and heat conditions. Additionally, it forms six-ring chelating compounds with metal ions in the water system, particularly Ca2+, and has good scale inhibition effects as well as dissolution threshold effects. Furthermore, when combined with other Water Treatment Chemicals, the synergistic results are further enhanced.


AppearanceColorless to yellowish transparent liquidWhite powder
Active content(HEDP)% ≥16.574.0-79.0
Active content (HEDP•Na2)% ≥2089.8
density (20℃)g/cm3 1.12-1.22--
Fe3+ μg/g ≤--35
Phosphorous acid (asPO33-)% ≤ --2
Moisture,% --3-6
PH (1% water solution) 4.0-6.04.0-6.0

HEDP•Na2  Usage:

HEDP•Na2 is widely used in different fields for scale and corrosion inhibition, such as electric power, chemical industry, metallurgy, fertilizer, circulating excellent water systems, medium to low-pressure boilers, and oil field pipelines. Additionally, it can be utilized as a detergent for both metal and nonmetal in the light-weaved industry and a dyes fixation agent within the dyeing industry. In non-cyanide electroplating processes, this organophosphorus acid acts as an effective chelating agent.

Package and Storage:

HEDP•Na2 plastic drum,30kg or 250kg, or confirmed by clients. Storage for ten months in a shady room and dry place.

Safety Protection:

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

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