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HEDP – Hydroxyethylidene Diphosphonic Acid

Premium-grade organic phosphonic acid for industrial water treatment, corrosion inhibition, and chelation. Manufactured by Shandong IRO HEDP Co., Ltd. – a trusted global supplier since 2003.

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About IRO Chemical

Shandong IRO HEDP Co., Ltd. is a leading manufacturer and supplier of high-purity water treatment chemicals, specializing in HEDP (Hydroxyethylidene Diphosphonic Acid) and related phosphonates. Founded in 2003, we have grown into a global enterprise with dedicated units for chelating agents, biocides, oilfield chemicals, and surfactants.

As an experienced supplier, IRO maintains its own HEDP production facility, ensuring consistent quality, traceability, and scalability. Our products are used in industrial cooling systems, metal cleaning, textile processing, and electronic applications where high chemical stability and low impurity levels are critical.

20+ Years
Industry Experience
60+ Countries
Global Reach
IRO Factory and Lab

Our Product Range

High-purity HEDP and related chemicals engineered for performance, stability, and compatibility in demanding industrial environments.

HEDP Acid

HEDP Acid

Hydroxyethylidene Diphosphonic Acid (CAS 2809-21-4)

  • Active content: 58.0–62.0%
  • pH (1% sol.): ≤2.0
  • Density: 1.43–1.47 g/cm³
  • Packing: 200L drum, IBC
HEDP 60

HEDP 60

Concentrated HEDP Solution

  • Active HEDP: 58–62%
  • Low chloride: ≤100 ppm
  • Stable up to 250°C
  • Excellent chelation
HEDP Na4

HEDP Na4

Tetrasodium Salt of HEDP

  • High solubility in water
  • Used in detergents
  • Effective at high pH
  • Low corrosivity
Etidronate

Etidronate

Disodium Salt (CAS 2809-21-4)

  • Also known as HEDP-Na2
  • Used in medical & industrial
  • Strong scale inhibition
  • Good chlorine tolerance
Sodium Etidronate

Sodium Etidronate

High-Purity Chelating Agent

  • ≥90% active content
  • Low metal impurities
  • Used in pharmaceuticals
  • Stable in H₂O₂ systems
EDTA Series

EDTA Acid

Ethylenediaminetetraacetic Acid

  • Strong chelator for metals
  • Used in textiles & cleaning
  • High stability constant
  • Available in Na₂, Na₄ forms
DTPMPA

DTPMPA

Diethylenetriamine Penta(methylene phosphonic acid)

  • Excellent CaCO₃ inhibition
  • Thermal stability up to 200°C
  • Synergistic with polymers
  • Used in oilfield water
ATMP

ATMP

Aminotris(methylenephosphonic acid)

  • CAS: 6419-19-8
  • Effective in low pH
  • Good zinc stabilization
  • Used in cooling towers
PBTCA

PBTCA

Polyepoxysuccinic Acid

  • Biodegradable scale inhibitor
  • Non-toxic and eco-friendly
  • Used in green formulations
  • Good dispersion properties
HPAA

HPAA

Hydroxyphosphonoacetic Acid

  • High threshold inhibition
  • Effective in high Ca²⁺ water
  • Resists chlorine oxidation
  • Used in RO systems
Glutaraldehyde

Glutaraldehyde

Biocide for Water Systems

  • 50% solution available
  • Broad-spectrum biocide
  • Used in cooling & oilfield
  • Fast-acting and stable
THPS

THPS

Tetrakis Hydroxymethyl Phosphonium Sulfate

  • Effective at low doses
  • Biodegradable
  • Used in oil & gas
  • Non-oxidizing biocide

Key Applications

HEDP and related phosphonates are used across industries for scale inhibition, corrosion protection, and metal chelation.

🏭

Industrial Water Treatment

Cooling towers, boilers, and closed-loop systems benefit from HEDP’s scale and corrosion inhibition.

🏊

Swimming Pools

Prevents calcium scaling and maintains water clarity with chlorine compatibility.

🔧

Metal Surface Treatment

Protects steel and other metals from corrosion during processing and storage.

🧼

Industrial Detergents

Enhances cleaning power by sequestering metal ions in hard water.

🧵

Textile Industry

Used as a stabilizer and chelating agent in dyeing and bleaching processes.

⚡

Electronic Cleaning

High-purity HEDP powder removes oxidized materials without residue.

60+
Countries Served
20+
Years in Business
10+
Product Lines
250°C
Thermal Stability

Frequently Asked Questions

What is HEDP used for?

HEDP is primarily used as a scale and corrosion inhibitor in industrial water systems, metal cleaning, detergents, and textile processing. It also acts as a chelating agent for metal ions.

Is HEDP biodegradable?

HEDP is not readily biodegradable but has low toxicity and is stable under a wide range of pH and temperature conditions.

What is the CAS number of HEDP?

The CAS number for HEDP (Hydroxyethylidene Diphosphonic Acid) is 2809-21-4.

Can HEDP be used in high-temperature systems?

Yes, HEDP shows excellent scale and corrosion inhibition effects at temperatures up to 250°C.

What packaging options are available?

HEDP liquid is packed in 200L plastic drums or 1000L IBC totes. Solid HEDP powder is packed in 25kg bags. Custom packaging is available.

Get in Touch

For quotations, technical support, or partnership opportunities, contact our global team.

📧 Water Treatment Unit: [email protected]
📧 Chelating Agents: [email protected]
📧 Biocides: [email protected]
📞 Gary (China): +86 532 8502 7466
📞 Jeff (USA): +1 804 245 2256
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