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1-Hydroxy ETHYLIDEN-1,1-Diphosphonic Acid

  • Place of Origin: China (Mainland)
1-Hydroxy ETHYLIDEN-1,1-Diphosphonic Acid
Supplier Details
Company: Shandong Iro Chelating Chemical Co., Ltd.
Tel: 86 - 0532 - 66888201
Address: No.42-44, Zhongshan RD, Qingdao, Shandong, China Qingdao Shandong 266000 China
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Selling Parameters


HEDP is an organophosphoric 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 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. Its acid/alkali and chlorine oxidation tolerance are better than that of other organophosphoric acids (salt). HEDP can react with metal ions in water system to form 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. Because of its high purity, it can be used as cleaning agent in electronic fields and as additives in daily chemicals.





Colorless or light yellow transparent liquid

White crystal powder

Active content(HEDP)%


89.0 min

Phosphorous acid(as PO33-)%

2.0 max

0.5 max

Phosphoric acid (asPO43- )%

0.8 max

0.5 max

Chloride (as Cl-)%

0.01 max

0.01 max

pH(1% solution)

2 max

2 max

Density (20℃)g/cm3


Fe ion ppm

10 max

20 max

Colour APHA (Hazen)

40 max


HEDP is used as scale and corrosion inhibition in circulating cool water system, oil field and low-pressure boilers in fields such as electric power, chemical industry, metallurgy, fertilizer, etc.. In light woven industry, HEDP is used as detergent for metal and nonmetal. In dyeing industry, HEDP is used as peroxide stabilizer and dye-fixing agent; In non-cyanide electroplating, HEDP is used as chelating agent. 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.

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. 

Company Profile
IRO Chelating Chemicals Ltd. (IRO Chelating) is a ISO 9001:2000 certified company manufacturing the entire range of chelating/sequestering agents and water treatment chemicals for over decade.Distinctive foresight gave IRO Chelating the direction to its chelating chemicals manufacture in China. Commencing its operations with the manufacture of EDTA series (Ethylene Diamine Tetra Acetic Acid), IRO Chelating expanded the product range to other chelating agents like DTPA series (Diethylene Triamine Penta Acetic Acid), NTA series (Nitrilo Triacetic Acid), organophosphorus chelating chemicals (HEDP, ATMP, PBTCA etc) and their derivatives. The strong technical background and cumulative expertise in complex chemicals reactions of IRO Group has made IRO Chelating a leading producer with a large share in the chelating/sequestering chemicals segment in China.