HEDP/1-Hydroxy Ethylidene-1,1-Diphosphonic Acid
HEDP water treatment - Effective scale and corrosion inhibitor for water treatment.
HEDP/Hydroxy Ethylidene Diphosphonic Acid
- CAS Number: 2809-21-4
- UN NO.: 3265
- EINECS NO.: 220-552-8
- HS. Code: 2931499090
- Molecular Formula: C2H8O7P2
- Purity (%): Liquid 60% and Solid 90%
- Appearance: colorless or light yellow transparent liquid, white crystalline powder
- Packing: drum, bag, IBC or as customers' requirement
- Other Name: 1-Hydroxyethylidene-1,1-diphosphonic acid, Etidronic acid
Hydroxyethylidene Diphosphonic Acid Specification
| ITEMS | SPECIFICATIONS |
| Active content (HEDP) | 60%min |
| Phosphorous acid (as PO33-) | 2.0%max |
| Phosphorous acid (as PO34-) | 0.8%max |
| Chloride (as Cl-) | 100max |
| PH (1% solution) | 2max |
| Density (20℃)g/cm3 | 1.4min |
| Fe (iron) ppm | 10 max |
| Colour APHA (Hazen) | 30max |
| Sequestrant value(CaCO3)mg/g | 500min |
| ITEMS | SPECIFICATIONS |
| Active content (HEDP•H2O) | 98%min |
| Active content (HEDP) | 90%min |
| Phosphorous acid (as PO33-) | 0.8%max |
| Phosphorous acid (as PO34-) | 0.5%max |
| Chloride (as Cl-) | 100max |
| PH (1% solution 20℃)) | 2max |
| Iron(as Fe) ppm | 20max |
Types of Hydroxyethylidene Diphosphonic Acid
| Feature | Solid HEDP | Liquid HEDP |
| Handling & Use | Needs to dissolve in water before use | Ready-to-use, can be added directly |
| Transport Cost | Lower | Higher |
| Cold Climate | Excellent – no freezing issues | Poor – may freeze in winter |
| Best For | • Electronics cleaning • High-purity chemicals • Cold regions | • Industrial cooling water • Boilers, oilfield water • Easy on-site dosing |
| Cost & Storage | More economical for large volume, long distance. Requires dry storage. | Higher cost per active unit. Simple storage, but protect from freezing. |
What is HEDP Used for
- Scale Inhibition:Primarily used as an extremely effective scale inhibitor in industrial water treatment systems.
- Chelating Agent:Acts as a strong chelating agent in detergents and cleaning formulations to control metal ions.
- Corrosion Inhibition:Serves as a corrosion inhibitor for metal surfaces, particularly in cooling circuits and oilfield applications.
- Stabilizer:Functions as a stabilizer in textile and peroxide bleaching processes to prevent decomposition.
FAQ of 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid
Yes. HEDP is thermally stable and performs well in high-temperature environments like boilers and industrial cooling circuits.
Yes. HEDP is considered environmentally friendly. It is biodegradable and does not persist in the environment.
We test each batch in our in-house laboratory. A Certificate of Analysis (CoA) is provided with every shipment to confirm active content, purity, and other key specifications.
We provide full export documents: Commercial Invoice, Packing List, MSDS, Certificate of Analysis (CoA), and dangerous goods transport certificate (UN 3265).
Liquid: 250kg/ drum, 1.25mt/IBC, or as customers’ requirement.
Solid: 25kg/bag, customers’ requirement.
Store in a tightly sealed container in a cool, dry, well-ventilated place, away from acids and oxidizing agents.
HEDP Suppliers - HOO CHEMTEC
We are a professional manufacturer and supplier of Hydroxyethylidene Diphosphonic Acid (HEDP) with years of export experience. Here is why customers choose us:
Product Strength:
We supply both HEDP liquid (60%) and HEDP solid (98%+ powder). This gives you the flexibility to choose the right form for your application, climate, and shipping needs.
Quality You Can Rely On:
Every batch is tested in our own laboratory. We provide Certificate of Analysis (CoA) with each shipment to confirm active content, purity, and key specifications.
Safe & Compliant Shipping:
HEDP is classified as UN 3265 (Corrosive). We handle all dangerous goods documentation professionally, including MSDS, transport certificates, and export customs clearance.
Customer-Focused Service:
We offer responsive communication, timely delivery, and flexible packaging options. Whether you need small samples or full containers, we are here to support your business.
Contact HOO CHEMTEC today for quality HEDP and a reliable partnership.
