HEDP 60% (Etidronic Acid)ZEELCHEM™ 101 · Manufacturer & Supplier
HEDP 60% (1-hydroxyethylidene-1,1-diphosphonic acid, etidronic acid) is an organophosphonate scale and corrosion inhibitor and chelating agent. ZEELCHEM™ 101 strongly chelates iron, copper, zinc and calcium, stays stable up to 200 °C, and is widely used in cooling water, boilers, textile bleaching and RO antiscalants.
HEDP 60% Chemical Identity
| IUPAC name | (1-Hydroxyethane-1,1-diyl)bis(phosphonic acid) |
|---|---|
| Synonyms | HEDP, HEDPA, etidronic acid |
| Molecular formula | C₂H₈O₇P₂ |
| Molar mass | 206.03 g/mol |
| Chemical class | Organophosphonate (bisphosphonate) |
| CAS number | 2809-21-4 |
HEDP 60% Specifications
Typical specification for ZEELCHEM™ 101. Every batch is dispatched with a batch Certificate of Analysis (COA).
| Parameter | Specification |
|---|---|
| Chemical name | 1-Hydroxyethylidene-1,1-diphosphonic acid |
| Chemical formula | C₂H₈O₇P₂ |
| CAS number | 2809-21-4 |
| Active HEDP | 58.0 – 62.0% |
| Phosphorous acid | ≤ 2.0% max |
| Iron (Fe) | ≤ 10 ppm max |
| Specific gravity | 1.43 – 1.46 g/cm³ |
| pH (1% solution) | ≤ 2.0 |
Applications & Recommended Dosing
Typical starting doses. Final dosing depends on your water analysis and system conditions; our chemists can help you optimize it.
| Application | Dose |
|---|---|
| Recirculating cooling water | 2.0 – 10.0 ppm |
| Low-pressure steam boilers | 5.0 – 20.0 ppm |
| Peroxide bleach stabilization | 1.0 – 3.0 g/L |
| RO antiscalant formulation | 2.0 – 5.0 ppm |
- Recirculating cooling water
- Low-pressure steam boilers
- Textile & pulp peroxide bleaching
- RO antiscalant formulation
- Pool metal-stain control
- Detergents, metal cleaning & electroplating
How HEDP 60% Works
Chelation
Two C–P bonds form stable ring chelates with Ca, Mg, Fe, Cu and Zn ions.
Threshold inhibition
Low doses stop calcium carbonate from forming hard deposits.
Corrosion passivation
Forms protective films on metal surfaces, especially with zinc salts.
Key Benefits
- Dual action: scale inhibition and cathodic corrosion protection
- Resists hydrolysis, unlike inorganic polyphosphates; stable to 200 °C
- Low iron (≤ 10 ppm max) to limit staining in bleach baths
- Works with PAA, PMA, AA/AMPS copolymers and zinc salts
- Cost-effective, all-round phosphonate
How much HEDP 60% do you need?
Packaging, Storage & Safety
⬢Packaging
- 65 kg carboys
- 250 kg virgin HDPE drums
- 1,250 kg IBC totes
- Rubber-lined road tankers
❄Storage & Shelf Life
- Store in acid-proof HDPE or lined tanks; avoid carbon steel
- Keep in a cool, dry, ventilated area away from sunlight, freezing and strong alkalis
- Shelf life: 24 months from date of manufacture
⚠Handling & Safety
- Corrosive acidic liquid
- Wear chemical goggles, face shield and rubber gloves
- Eye or skin contact: flush with water for 15 minutes. If swallowed, rinse mouth, do not induce vomiting, and seek medical help
Always read the Safety Data Sheet (MSDS/SDS) before handling. Pan-India dispatch from Vadodara, Gujarat.
TDS, MSDS & COA for HEDP 60%
Request documents instantly on WhatsApp. ZEEL PRODUCT is ISO 9001:2015, ISO 14001:2015 & ISO 22000:2018 certified.
Safety Data Sheet (MSDS)
16-section GHS-format safety, handling and transport information.
Request MSDS →HEDP 60%: Frequently Asked Questions
What is HEDP 60% and what are its key properties?
HEDP is an organophosphonic acid scale and corrosion inhibitor. It strongly chelates Fe, Cu, Zn and Ca and stays chemically stable up to 200 °C.
What is the HEDP dosage for cooling towers?
2–10 ppm active in open recirculating cooling systems, and 5–20 ppm in low-pressure industrial boilers.
How does HEDP stabilize hydrogen peroxide bleaching?
At 1–3 g/L, HEDP chelates trace iron, copper and manganese, which would otherwise decompose the peroxide.
What is the active content and iron level of ZEELCHEM™ 101?
58–62% active HEDP, with iron at 10 ppm maximum to prevent discoloration.
Is HEDP compatible with polymers?
Yes. HEDP works with PAA, PMA, AA/AMPS copolymer dispersants and zinc salts to form corrosion-inhibiting films.
What is the difference between HEDP and PBTC?
Both are phosphonates. HEDP is the economical all-rounder and chelant. PBTC is more stable with chlorine and bromine and tolerates higher hardness and pH.
Can HEDP remove metal stains in swimming pools?
Yes. It sequesters dissolved iron, copper and manganese, preventing staining and discoloration.
What packaging is available for HEDP 60%?
65 kg carboys, 250 kg virgin HDPE drums, 1,250 kg IBC totes and rubber-lined road tankers.
How should HEDP be stored?
In corrosion-resistant HDPE or lined containers, in a dry, ventilated area away from sunlight, freezing and strong alkalis. Shelf life is 24 months.
Is a COA supplied with every HEDP batch?
Yes. Each batch is QA-tested and shipped with a batch COA. The TDS and 16-section GHS MSDS are available on request.
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Buy HEDP 60% (Etidronic Acid) Direct from the Manufacturer
Bulk pricing, samples and technical support for plants across India, from Gujarat and Maharashtra to Delhi NCR and South India.