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Product Name:1-Hydroxyethane 1,1-Diphosphonic Acid/HEDP
Chemical name:1-Hydroxyethylidene-1,1-Diphosphonic Acid(HEDP) china water treatment chemicals
Abbreviation: HEDP
Molecular Formula: C2H8O7P2
Molecular Weight: 206
CAS Number：2809-21-4
Purity：50%、60%、90%
Application Notes: Noted for its excellent CaCO3 scale inhibition and chlorine stability.
Product Description：
1. HEDP is an organophosphoric acid corrosion inhibitor. It can chelate with Fe, Cu, and Zn etc. metal ions and form stable complex compound. It can dissolve the oxidized materials on these metals’ surfaces. Under 250°C. HEDP shows excellent scale and corrosion inhibition ability.
2. HEDP has good chemical stability under high pH value, hard to be hydrolyzed, and hard to be decomposed under ordinary light and heat conditions. Its acid/alkali and chlorine oxidation tolerance are better than that of other organophosphoric acids (salt).
3. HEDP can react with metal ions in water system to form hexa-element chelating complex, with calcium ion in particular. Therefore, HEDP has good antiscale and visible threshold effects. When built together with other water treatment chemicals, it shows good synergistic effects.
4. The solid of HEDP is high purity product, suitable for using in winter and freezing districts. it is quite suitable for using as cleaning agent in electronic fields and as additives in daily chemicals.
Technical Data：
| items | index | |
| Appearance | Clear, Colorless to pale yellow aqueous solution | White crystal powder |
| Active content (HEDP)% | 58.0-62.0 | 90.0min |
| Phosphorous acid (as PO33-)% | 1.0 max | 0.8 max |
| Phosphoric acid (asPO43-)% | 0.6 max | 0.5 max |
| Chloride (as Cl-) ppm | 100.0 max | 100.0max |
| pH (1% solution) | 2.0 max | 2.0 max |
| Density (20°C)g/cm3 | 1.43-1.47 | - |
| Fe,mg/L | Fe,mg/L | 5.0 max |
| Colour APHA (Hazen) | 30.0 max | - |
| Acetic acid % | 0.5 max | - |
| Ca sequestration (mg CaCO3/g) | 500.0 min | - |
Application Range：
1. HEDP is widely used in the in circulating cool water system of electric power, chemical industry, metallurgy, fertilizer, etc. and widely used as a scale and corrosion inhibitor of low-pressure boilers, field waterflood, oil pipeline.
2. In light&textile industry, HEDP is used as detergent for metal and nonmetal. In dyeing industry, HEDP is used as peroxide stabilizer and dye-fixing agent.
3. In non-cyanide electroplating, HEDP is used as chelating agent. The dosage of 1-10mg/L is preferred as scale inhibitor, 10-50mg/L as corrosion inhibitor, and 1000-2000mg/L as detergent. Usually, HEDP is used together with polycarboxylic acid.
Recommended Uses: Cooling water treatment, boiler treatment, I & I cleaners, swimming pool stain prevention, metal ion control
Package and Storage：
HEDP liquid: 200L plastic drum,IBC(1000L),customers’ requirement.
HEDP solid: 25kg/bag,customers’ requirement.
Storage for ten months in room shady and dry place.
| Item | Packing | Quantity/FCL | N.W./FCL | G.W./FCL |
| 90% | 25Kgs/Bag | 480Bags | 12.00MT | 12.24MT |
| 60% | 250Kgs/Plastic Drum | 80Drums | 20.00MT | 20.80MT |
Store above 0℃/32℉.
Do not use steel containers. Suitable containers include polyethylene, polypropylene, fibreglass,glasslined steel and polyvinyl chloride. Do not use copper or brass plumbing or valves. Ensure that containers, whether empty or full, or part full, are tightly sealed unless in use.
Avoid creating or breathing product mist. Use with adequate exhaust ventilation if a mist is created.
Transport Information：
DOT Classification: Class 8: Corrosive material
Identification: : Corrosive Liquid, Acid, Organic, n.o.s. (1-hydroxyethanediphosphonic acid) UNNA: 3265 PG: III
Special Provisions for Transport: Not available.
Safety Protection：
Acidity, Avoid contact with eye and skin, once contacted, flush with water
Synonyms：
HEDP;HEDP(A);ETIDRONIC ACID;1-Hydroxy Ethylidene-1,1-Diphosphonic Acid; Hydroxyethylidene-1,1-diphosphonicacid(HEDP); 1-HYDROXYETHYLIDENEDIPHOSPHONIC ACID;Hydroxyethylidene Diphosphonic acid(HEDP); 1-hydroxy-1,1-Ethanediyl ester
