HEDPA CAS No. 2809-21-4

Payment Type: L/C,T/T,D/P
Incoterm: FOB,CFR,CIF

Additional Info

Transportation: Ocean,Land,Air

Place of Origin: China

Port: Shanghai,Tianjin,Qingdao

Product Description

CAS NO. 2809-21-4
Molecular Formula:C2H8O7P2
Molecular Weight: 206.02

Items Standard
Liquid Solid
Appearance Clear, Colorless or yellow liquid White crystal powder
Active content (HEDP) 60.0% Min 90.0% Min
Active content (HEDP·H2O) - 98.0% Min
Phosphorous acid (as PO33-) 2.0% Max 0.8% Max
Phosphoric acid  (as PO43- ) 0.8% Max 0.5% Max
Chloride (as Cl-) 0.02% Max 0.01% Max
pH (1% water solution) 2.0 Max 2.0 Max
Density  (20℃) g/cm3 1.40 Min -
Fe, mg/L 20.0 Max 10.0 Max
Ca sequestration (mg CaCO3/g) 500.0 Min

Product Advantage:

HEDPA 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. HEDPA shows excellent scale and corrosion inhibition effects under temperature 250℃. HEDPA 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). HEDPA can react with metal ions in water system to form hexa-element chelating complex, with calcium ion in particular. Therefore, HEDPA has good antiscale and visible threshold effects. When built together with other water treatment chemicals, it shows good synergistic effects.

Product use:
The solid state of HEDPA 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. 

Method of use: 

HEDPA 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, HEDPA is used as detergent for metal and nonmetal. In dyeing industry, HEDPA is used as peroxide stabilizer and dye-fixing agent; In non-cyanide electroplating, HEDPA 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, HEDPA is used together with polycarboxylic acid.

Packing and storage:

liquid:200L plastic drum,IBC(1000L),customers' requirement.
solid: Every 25Kg of solid products should be put in one bag with inner plastic film and outer plastic woven bag, OR customers' requirement.

Storage for ten months in shady room and dry place.

1-Hydroxyethylidene Diphosphonic Acid

Contact Info


Shaanxi United Xingchuang International Co., Ltd.

Address: Fengdong New City of XiXian New Area, Shaanxi.,Xian,Shaanxi

Contact Person: Sally Sun



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