Caustic Soda Flakes

Product Name: HEDP

Synonyms: 1-Hydroxyethylidene-1,1-diphosphonic acid; HEDPA

CAS NO: 2809-21-4

Molecular Structure: C2H8O7P2

Hazard Class: 8

Min Order Qty: 1mts

Qty in 20' FCL: 23.2mts

Certificate: ISO9001:2008,

 Packing Details: 290kg/Drum

Delivery Time: 30-45 days

Supply Ability: 2000MTS per month

HS Code: 2942000000


Commodities Name1-Hydroxy Ethylidene-1,1-Diphosphonic Acid(HEDP)
AppearanceClear, Colorless to pale yellow aqueous solutionWhite crystal powder
Active content (HEDP)%60.0 min90.0 min
Active content (HEDP.H2O) %-98.0 min
Phosphorous acid (as PO33-) %2.0 max0.8 max
Phosphoric acid(as PO43- )%0.8 max0.5 max
Chloride (as Cl-) %0.02 max0.01 max
pH (1% water solution)2.0 max2.0 max
Density?(20℃)g/cm31.40 min-
Fe, mg/L20.0 max10.0 max
Ca sequestration (mg CaCO3/g)500.0 min


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.


1. It can be used in cooling water systems, pipelines and boiler scale, it can be as high hardness, high salinity and other water quality is poor oil pipeline inhibitors.

2.  It can be used for cooling water, boiler water, oilfield water treatment scale inhibitor and corrosion inhibitor

3. It can be used for circulating cooling thermal power plants, refineries.


11. What kinds of certificates can you offer?
YuXiang Chemical is an ISO2008 9001 certified company, as for HEDP, we can offer REACH registration.
22. IsYuxiang Chemical a manufacturer or a trading company?
Yuxiang chemical is a group company with its own production base located in Jiangsu and Zhejiang province. For more than 20 years’ development, Yuxiang also joins up with several local plants to evaluate some special chemicals including R&D, production process and sales strategy.
33. What is your advantage on HEDP?
More than 10 years’ experience in supplying HEDP to world market with competitive prices and stable supply.
44. How long shall we wait for your reply?
We can guarantee to reply your inquiries in less than 24 hours in working days.
55. Can we get some samples for interesting chemicals?
Yes. We can provide testing samples after receiving from the customers detailed inquiries as well as COA confirmed.
66. Are your payment terms negotiable?
Yes. Our payment terms are negotiable according to different trading conditions. We’ll always try our best to satisfy the customers for both benefit.
77. Do you accept long term contract? For example, one year.
Most of the chemicals’ prices changes from time to time but some are stable. We can discuss individually and see what we can do for you.