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Hydroxyethane Diphosphonic Acid

Hydroxyethane Diphosphonic Acid
Hydroxyethane Diphosphonic Acid
Product Code : AI14
Product Specifications
  • Taste
  • Other
  • Physical Form
  • Liquid
Product Description

Detailed Product Description

Colorless to light yellow transparent liquid HEDP Acid, 50%-60% CAS 2809-21-4 1-Hydroxy Ethylidene-1, 1-Diphosphonic Acid

Chemical Name:1-Hydroxy Ethylidene-1,1-Diphosphonic Acid

Abbreviation: HEDP

Synonym: HEDPA, HEDP(A), Etidronic Acid

CAS No.: 2809-21-4

Molecular Formula: C2H8O7P2

Molecular weight: 206.02 g/mol

Structural Formula:


HEDP can chelate with Fe, Cu, and Zn ions to form stable chelating compounds. It 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. So HEDP is normally 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.


Items of Analysis

Standard Spec.


Colorless to light yellow transparent liquid

Active content (HEDP), %

50.0 - 60.0

Phosphorous Acid (as PO33-), %

2.0 Max

Phosphoric Acid (as PO43-), %

0.8 Max

Density (@ 20ƒ), g/cm3

1.41 - 1.47

Chloride (as Cl), %

0.5 Max

pH (1% water solution, @ 25ƒ)

2.0 Max

Iron (as Fe), ppm

10.0 Max

Ca2+ Sequestration,(as CaCO3 mg/g )

500 Min

Safety Protection:

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

Tag : cas 2809-21-4, 1-diphosphonic acid

Trade Information
  • Main Domestic Market
  • All India


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