●(1) Molecular Weight & Chemical Structure:　 O O H O ‖ | ‖ (HO)2 P - C - P (OH)2 | C H 3 ●(2) Properties: The product shows good stability under high pH value, hardly being hydrolyzed. Its low toxicity could be easily turned out of the human body. The product works effectively under the temperature of 200℃. It can chelate with Fe、Cu、Al、Zn ions forming chelate compound. Due to its solubilizing affect in dissolving the surface oxidized materials of the metals. ●（3）Specification: Kind Domestic Products export subsidy Appearance colorless or pale yellow transparent liquid Active content(as HEDPA) ≥50% 58~62% Phosphorous acid(as H3PO3) ≤3.0% ≤3.0% Phosphoric acid(as PO4) ≤1.0% iron＜35ppm Chloride (as Cl-) ≤1.0% ≤1.0% pH(1% water solution) ＜2 ＜2 Density(20℃g/cm3) 1.34~1.48 1.40~1.48 Ca sequestration mgCaCO3/ g ＞400 Color (APHA) 150max After detected with 31P—NMP it is concluded that this NC-201 has the content of more than 96%, which is in accordance with the DEQUEST2010 standards set by American Monsanto Chemical Company.
This product is mainly used in boilers and heat exchanger pipe-lines as scale inhibitors and corrosion inhibitors. It can also be used as metal and non-metal cleaner, and as stabilizer and color fixing agent in textile bleaching industry.

CAS NO:2809-21-4

EC NO:220-552-8

Molecular Formula:C₂H₈O₇P₂

Molecular Weight:201.9987

Synonyms:;1-Hydroxyethane-1,1-diphosphonic Acid;Etidronic acid;HEDP;HEDPA; Hydroxy Ethylidene-1,1-Diphosphonic Acid;1-Hydroxy Ethylidene-1,1-Diphosphonic Acid;1-Hydroxyethylidene diphosphonic Acid;1-hydroxy ethylene-1,1-diphosphonic acid;1-HYDROXYETHYLIDENEDI(PHOSPHONIC ACID);disodium (1-hydroxyethane-1,1-diyl)bis[hydrogen(phosphonate)];(1-hydroxyethane-1,1-diyl)bis(phosphonate);Hydroxyethylidenedi(phosphonic acid);Hydroxyethylidine Diphosphonic Acid;HydroxyEthylidene Diphosphonic acid;

Molecular Structure: