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Jinan, Shandong, China

1-Hydroxyethylidene-1,1-diphosphonic acid CAS 2809-21-4

Sodium dichloroisocyanurate CAS 2893-78-9
Sodium dichloroisocyanurate CAS 2893-78-9



1-Hydroxyethylidene-1,1-diphosphonic acid Quick Details:
  • Chemical Name: 1-Hydroxyethylidene-1,1-diphosphonic acid / HEDP
  • CAS:2809-21-4
  • Molecular Formula: C2H8O7P2
  • Molecular Weight: 206.03
  • Appearance: White Crystal Powder / colorless liquid
  • Assay: 50%min 60%min 98%min
1-Hydroxyethylidene-1,1-diphosphonic acid Specification:
60% HEDP
Item Index
Appearance Colorless or pale yellow transparent liquid
PHOSPHOROUS ACID (as PO33-) % ≤ 2.0
PHOSPHORIC ACID (asPO43-) % ≤ 1.0
PH(1% solution) ≤ 2.0
Density (20℃)g/cm3 1.4
Fe ion ppm ≤ 10
Chloride (as Cl-)% ≤ 100ppm


98% HEDP
Appearance White Crystal Powder
Active Content(as HEDP)% 90.0 Min.
Active Content(as HEDP·H2O)% 98.0 Min.
Phosphorous Acid (as PO33-)% 0.8 Max.
Phosphorous Acid (as PO43-)% 0.5 Max.
PH (1% solution) 2.0 Max.
Chlorides (as CL-) ppm 100 Max.
Iron ppm 10 Max.
1-Hydroxyethylidene-1,1-diphosphonic acid Application:
  • It is commonly used as scale and corrosion inhibitor in boiler water, circulating water and oilfield water injection.
  • It is often compounded with polyhydroxy acid scale inhibitor and dispersant.
  • It can also be used as cyanide-free electroplating complexing agent, fixing agent for bleaching and dyeing industry, and hydrogen peroxide stabilizer.
1-Hydroxyethylidene-1,1-diphosphonic acid Package:

1-10 kg/bag  25 kg/bag or depending on your needs!


Store in a cool, ventilated place indoors, moisture-proof, storage period of ten months.

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