1-Hydroxyethylidene-1,1-diphosphonic acid / HEDP CAS 2809-21-4

Chemical Name: HEDP

CAS No.: 2809-21-4

Molecular Fomula:C2H8O7P2

Chemical Structure:HEDP Structure

Molecular weight: 206.03

Appearance:White crystal


HEDP CAS 2809-21-4




Withe crystal powder

Active content(HEDP)%




Chloride(as Cl-)%


PH (1% solution)




Phosphoric acid(as PO3³‾)


Phosphoric acid(as PO4³‾)



HEDP 90% powder Application

1. Hydroxyethylidene diphosphonic acid (HEDP) is a new type of chlorine-free electroplating complexing agent, used as the main agent of stable water quality in the circulating cooling water system, and has the effect of corrosion and scale inhibition.

2. This product is one of the organic and non-phosphonic acid water sheeting agents. There are some other varieties of this kind of products produced in China, such as amino trimethylene phosphonic acid (ATMP): [CH2PO(OH)2]3N And ethylene diamine tetramethylene phosphoric acid (EDTMP) and so on.

3. 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 made water sheeting technology a big step forward. Compared with organic polyphosphate, organic polyphosphonic acid has the characteristics of chemical stability of good medicine, not easy to hydrolyze, can withstand higher temperature and small dosage, and has the characteristics of anti-scaling performance.

4. It is a kind of cathode type corrosion inhibitor and a kind of non-chemical equivalent scale inhibitor. When used in combination with other water treatment agents, it exhibits an ideal synergistic effect. It has excellent chelating ability to many metal ions such as calcium, magnesium, copper, zinc, etc., and even has good deactivation effect on inorganic salts of these metals such as CaSO4, CaCO3, MgSiO3, etc., so it is widely used in water treatment technology. The product is low in toxicity, and the LD50 of subcutaneous injection in mice is 486.4mg/kg.


HEDP Packaging and Storage

Packaging:25KG/ bag. Compound cowhide paper bag, lined.


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