1-Hydroxy Ethylidene-1,1-Diphosphonic Acid(HEDP)
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HEDP;HEDP(A);HEDPA;
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;
Oxyethylidenediphosphonic Acid(OEDP)
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CAS No. 2809-21-4
Molecular Formula: C2H8O7P2 Molecular weight: 206.02
Structural Formula:
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HEDP is a widely used organic phosphonic acid compound in water treatment applications.HEDP has good chemical stability under high pH value and is hard to be hydrolyzed.It is a highly effective scale ,HEDP is a popular EDTA substitute,HEDP is commonly utilized in industrial water systems, boilers, cooling towers, and other water treatment processes.
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Items |
Index |
|
Appearance |
Clear, Colorless to pale yellow aqueous solution |
White crystal powder |
Active content (HEDP), % |
58-62 |
90.0 min |
Active content (HEDP·H2O), % |
- |
98.0 min |
Phosphorous acid (as PO33-), % |
2.0 max |
0.8 max |
Phosphoric acid (as PO43-), % |
0.8 max |
0.5 max |
Chloride (as Cl-), ppm |
100.0 max |
100.0max |
pH (1% water solution) |
2.0 max |
2.0 max |
Density (20℃), g/cm3 |
1.43-1.47 |
- |
Fe, mg/L |
20.0 max |
10.0 max |
Color APHA (Hazen) |
40.0 max |
- |
Ca Sequestration (mg CaCO3/g) |
500.0 min |
 |
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HEDP is used together with polycarboxylic acid.The solid state of HEDP is crystal powder, suitable for usage in winter and freezing districts.
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HEDP liquid: 200L plastic drum,IBC(1000L),customers’ requirement.
HEDP solid: 25kg/bag,customers’ requirement.
Storage for twelve months in room shady and dry place.
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Acidity, Avoid contact with eye and skin, once contacted, flush with water. 
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