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HEDP (Hydroxyethylidene Diphosphonic Acid) is a highly effective phosphonate compound used in various industries. It exhibits excellent scale and corrosion inhibition properties, making it ideal for water treatment applications. With its exceptional stability and low toxicity, HEDP is a trusted choice for ensuring clean and reliable water supply in industrial, commercial, and residential settings.

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Product Detail

CAS No. 2809 21 4

Molecular Formula: C2H8N3O7P2

Molecular weight: 206.02

Structural Formula:

Product Grade:Industrial

Description & Application:

HEDP, also known as 1-Hydroxyethylidene-1,1-Diphosphonic Acid, is a widely used chemical compound with the CAS number2809 21 4. It is a highly effective chelating agent and scale inhibitor. HEDP exhibits excellent stability under extreme conditions, making it suitable for various industrial applications.

HEDP is a scale and synergistic corrosion inhibitor for iron rust and mineral scalefrom pipes of cooling circulation water units and boilers; Metal chelateagent for color fixing and bleaching in textile; Complexing agent for electronplate and scale cleaning agent for metals.

HEDP is recognized for its ability to prevent the formation of scale and reduce corrosion in water systems. It is commonly used in cooling water treatment, oilfield applications, and household cleaning products. HEDP maintains its effectiveness over a wide pH range, making it suitable for diverse environments.With its ability to withstand varying pH levels, it has become a valuable ingredient in many industrial processes and water treatment applications.

At a concentration of 1%, the hedp ph solution is typically around 2.3-2.7.

Safety Protection:

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





Colorless to pale yellow transparent liquid

Active content (as acid)%


Phosphorous acid(as PO33-) %

≤ 2.5

Phosphoric acid(as PO43-)%

≤ 0.7

Chloride (as Cl-) %

≤ 0.50

pH(1% solution)

≤ 2.0

Density(20℃) g/cm3


Calcium sequestration mg/g

≥ 500


200L Drum, 1000L IBC or Bulk.Stored in cool and dry place.

Shelf Life:

1 year


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