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HEDP is an organophosphorus acid corrosion inhibitor. It can chelate with Fe, Cu, and Zn ions to form stable chelating compounds. It can dissolve the oxidized materials on these metals’ surfaces.

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Product Description

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

hedp 60

Other name:
Molecular Formula: 
Molecular weight: 
Structural Formula:



HEDP is an organophosphorus acid corrosion inhibitor. It can chelate with Fe, Cu, and Zn ions to form stable chelating compounds. It can dissolve the oxidized materials on these metals’ surfaces. HEDP shows the excellent scale and corrosion inhibition effects under temperature 250℃. HEDP has good chemical stability under high pH value, hard to be hydrolyzed, and hard to be decomposed under ordinary light and heat conditions. It's acid/alkali and chlorine oxidation tolerance is better than that of other organophosphorus acids (salt). HEDP can react with metal ions in the water system to form a Hexa-element chelating complex, with calcium ion in particular. Therefore, HEDP has good antiscale and visible threshold effects. When built together with other water treatment chemicals, it shows good synergistic effects.

The solid-state of HEDP is crystal powder, suitable for usage in winter and freezing districts. Its high purity can be used as a cleaning agent in electronic fields and as additives in daily chemicals.





Clear, Colorless to pale yellow aqueous solution

White crystal powder

Active content (HEDP)%



Phosphorous acid (as PO33-)%

1.0 max

0.8 max

Phosphoric acid (asPO43-)%

0.6 max

0.5 max

Chloride (as Cl-) ppm

100.0 max


pH (1% solution)

2.0 max

2.0 max

Density (20℃)g/cm3




10.0 max

5.0 max

Colour APHA (Hazen)

30.0 max


Acetic acid %

0.5 max


Ca sequestration (mg CaCO3/g)

500.0 min



HEDP is used as scale and corrosion inhibition in circulating cool water systems, oil fields, and low-pressure boilers in electric power, chemical industry, metallurgy, fertilizer, etc. In the light woven industry, HEDP is used as detergent for metal and nonmetal. HEDP is used as a peroxide stabilizer and dye-fixing agent; In non-cyanide electroplating, HEDP is used as a chelating agent. The dosage of 1-10mg/L is preferred as a scale inhibitor, 10-50mg/L as a corrosion inhibitor, and 1000-2000mg/L as detergent. Usually, HEDP is used together with polycarboxylic acid.

Package and Storage:

HEDP liquid: Normally, In 250kg net Plastic Drum, IBC drum can also be used as required

HEDP solid: 25kg inner liner polyethylene (PE) bag, outer plastic woven bag, or confirmed by clients.

Storage for ten months in room shady and dry place.

Safety Protection:

Acidity, Avoid contact with eye and skin, once contacted, flush with water.



Etidronic Acid;

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


1-Hydroxyethylidenediphosphonic Acid;

Hydroxyethylidene Diphosphonic acid(HEDP);

1-Hydroxy-1,1-Ethanediyl ester;

Oxyethylidenediphosphonic Acid(OEDP)

Оксиэтилидендифосфоновая кислота(ОЭДФ -кислота )

hedp acid FAQ:

Material Safety Data Sheet for Hydroxyethylenediphosphonic Acid
HEDP Phosphate SDS Safety Data Sheet (Safety Data Sheet)

Hydroxyethylenebisphosphonic Acid (HEDP Phosphate) SDS, Safety Data Sheet.
MSDS sheet, Material Safety Data Sheet

Product Identification
Product Name / Synonyms. Hydroxyethylenebisphosphonic acid; Sal HEDP Phosphonate; HEDP(A); HEDPA; ETIDRONIC ACID; 1-Hydroxyethylidene-1,1-diphosphonic acid. 1-Hydroxyethylidene-1,1-diphosphonic acid (HEDP); 1-Hydroxyethylidene-1,1-diphosphonic acid (HEDP); 1-Hydroxy-1,1-ethanediyl ester
CAS No.: 2809-21-4
EINECS Number: 220-552-8
Molecular weight: 206.02
Chemical formula: C2H8O7P2 C2H8O7P2
Suggested Use and Suggested Prohibited Use (if any) Oil and gas well fracturing and industrial manufacturing.

Hazard Identification
GHS, Globally Harmonized System Classification following 29 CFR 1910.
Classification following Regulation (EC) No. 1272/2008.

Corrosive to metals Category 1
Acute toxicity. Oral, Category 4
Skin corrosion/irritation, Class 1A Class B Class C
Hazardous to the aquatic environment, Category 2 Acute hazard.

They are labeled following US GHS and Regulation (EC) No 1272/2008.

GHS labeling elements
Signal word. Hazard

Hazard statement.
H290: May be corrosive to metals.
H302: Harmful if swallowed.
H314: Can cause severe skin burns and eye damage.
H401: Toxic to aquatic organisms.

Precautionary statements.
P234: Store only in original container.
P260: Do not breathe.
P264: Wash hands thoroughly after handling.
P280::Wear protective gloves/eye protection/face protection.
P312: If you feel uncomfortable, call POISON CENTER or a doctor.
P301+P330+P331: If swallowed: rinse mouth. Do not cause vomiting.
P303+P361+P353: If in contact with skin (or hair). Take off/remove all contaminated clothing immediately. Rinse skin with water/shower.
P304+P340: If inhaled. Move victim to fresh air and keep at rest in a position comfortable for breathing.
P305+P351+P338: If in eyes: Carefully flush with water for several minutes. Remove contact lenses if available and easy to remove. Continue rinsing.
P363: Wash contaminated clothing before use.
P404: Store in a closed container.
P405: Store with a lock.
P390: Absorb spills to prevent material damage.
P501: Dispose of contents/containers through a waste management company authorized by the local government.

They were classified according to EU Directive 67/548/EEC or 1999/45/EC.
Hazard symbol.
nHazardous to the environment.
Risk Phrases.
R22-36-38:Harmful if swallowed. Irritating to eyes. Irritating to the skin.
R34 burns.
R41 = Risk of severe damage to eyes.
R51/53 is toxic to aquatic organisms and may cause long-term adverse effects on the marine environment.

Composition/composition information.
Composition:1-Hydroxyethylidene-1,1-diphosphonic acid or HEDP at 58-62%.
Chemical Abstract No.:2809-21-4.
European Inventory of Existing Chemical Substances No.:220-552-8.
First-aid measures.
Always seek medical attention after taking first aid measures.
Inhalation. Move to a new space of air. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Seek medical attention immediately.
Ingestion: Do not cause vomiting. Do not induce vomiting. Seek medical attention immediately. Do not give anything by mouth to an unconscious person.
Skin contact: Immediately wash skin with plenty of water for at least 15 minutes. Immediately rinse skin with plenty of water for at least 15 minutes. Remove contaminated clothing and shoes. I ask the doctor to treat and keep me healthy—Wash clothes before using again. Wash shoes thoroughly before using them. Wash shoes thoroughly before use and seek medical attention.

Eye contact. Immediately flush eyes with plenty of water for at least 15 minutes, occasionally elevating the upper and lower eyelids. Please do not allow the victim to rub his or her eyes. See a physician as soon as possible.
Fire Fighting Measures.

Fire:1-Hydroxyethylidene-1,1-phosphonic acid or HEDP phosphate is a slight fire hazard. The dust-air mixture may ignite or explode.

Extinguishing media. Use a method suitable for extinguishing surrounding fires in HEDP. Water spray may be used to keep containers exposed to fire cool. Dry chemicals, carbon dioxide, water, and foam are all acceptable.

Special Note: Appropriate methods can be used to extinguish fires over the HEDP. If a fire occurs over the HEDP, wear protective clothing and a NIOSH-approved self-contained breathing apparatus and operate under pressure-demand or another positive pressure mode.

Accidental release measures.
Personal precautions, protective equipment, environmental precautions, and emergency procedures. Avoid inhalation of dust/fume/gas/smoke/vapor/spray. Ventilate leaking or spill areas. Use personal protective equipment (waterproof boots, appropriate protective clothing, safety glasses, etc.).

Restrict unprotected personnel from entering the area. Prevent contact with hot surfaces. Do not approach wind. Do not come in contact with leaking materials. Keep away from drains, surface water, groundwater, and soil.

Methods of isolation and material cleanup procedures and storage. Seal spilled material. Clean up and containerize for recycling or disposal—recap with inert material.

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