Chinese (Simplified) Chinese (Simplified) Dutch Dutch English English French French German German Italian Italian Korean Korean Malay Malay Portuguese Portuguese Russian Russian Spanish Spanish
HEDP 90% 60% - Ecommerce website

HEDP 90% 60%


HEDP 50% 60% 90% 98%


CAS No.: 2809-21-4                         EINECS No.: 220-552-8
Molecular Formula: C2H8O7P2       Molecular Weight: 206.02


Structural Formula:


HEDP is a kind of scale and corrosion inhibitor which belongs to organic phosphonic acid. It can form stable complexes with iron, copper, zinc and other metal ions, and can also dissolve the metal surface oxide. Under 250 ℃ condition, HEDP can still play a good corrosion and scale inhibition effect.

HEDP has good chemical stability under high pH value, hard to be hydrolyzed, and hard to be decomposed under ordinary light and heat conditions. Its acid/alkali and chlorine oxidation tolerance show better than that of other organic phosphonic acid (salt) acids (salt).

HEDP can react with metal ions in water system to form hexa-element chelating complex, especially with calcium ions. Therefore, HEDP has good anti-scale and visible threshold effects. When used in combination with other water treatment chemicals, it shows ideal synergistic effects.

HEDP solid state is a high purity product, suitable for cold winter areas; Because of its high purity, it is especially used as the cleaning agents in electronics industry, and additives in daily chemicals.


HEDP is widely used as scale and corrosion inhibitor in industrial circulating cooling water systems of electric power, chemical industry, metallurgy, chemical fertilizer, and also in medium or low pressure boilers, oilfield water injection and oil pipeline.

Besides these applications, HEDP can also be used as cleaning agent of metal and nonmetal in the textile industry, as peroxide stabilizer and fixing agent in bleaching and dyeing industry, as complexing agent in cyanide free electroplating industry, as the carrier of radioactive elements in pharmaceutical industry, and so on.


Items Index
Appearance Clear, Colorless to pale yellow aqueous solution White crystal powder
Active content (HEDP)% 60.0 min 90.0 min
Active content (HEDP·H2O)% 98.0 min
Phosphorous acid (as PO33-)% 1.0 max 0.8 max
Phosphoric acid  (as PO43- )% 0.6 max 0.5 max
Chloride (as Cl)% 0.01 max 0.01 max
pH (1% water solution) 2.0 max 2.0 max
Density  (20℃)g/cm3 1.40 min
Fe, mg/L 10.0 max 5.0 max
Colour APHA (Hazen) 10.0 max
Ca sequestration (mg CaCO3/g) 500.0 min



The dosage of 1-10mg/L is preferred as scale inhibitor, 10-50mg/L as corrosion inhibitor, and 1000-2000mg/L as detergent. Usually, HEDP is used together with polycarboxylic acid.


HEDP; HEDP(A); HEDPA; Etidronic Acid;

1-Hydroxy Ethylidene-1,1-Diphosphonic Acid;

Hydroxyethylidene-1,1-diphosphonicacid (HEDP);

1-Hydroxyethylidenediphosphonic Acid;

Hydroxyethylidene Diphosphonic Acid (HEDP);

1-Hydroxy-1,1-Ethanediyl Ester;

Oxyethylidenediphosphonic Acid (OEDP);

Phosphonates Antiscalants, Corrosion Inhibitors and Chelating Agents


There are no reviews yet.

Be the first to review “HEDP 90% 60%”

Your email address will not be published. Required fields are marked *

Please note that although we endeavour to ensure that the product information displayed on our website is accurate and up to date, Products and their ingredients are liable to change. Due to this, You should always read the label before consuming or using the product and never rely solely on the information presented here. If You require information or have any queries regarding a Grano Organic Own Label product, please contact our Customer Care team. This information is supplied for personal use only and may not be reproduced in any way without the prior consent of Grano Organic and ackowledgement.