1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP)

• HEDP is an organophosphoric acid corrosion inhibitor. It can chelate with Fe, Cu, and Zn ions to form stable chelating compounds.It can dissolve the oxidized materials on these metals` surfaces. HEDP shows excellent scale and corrosion inhibition effects under temperature 250℃. 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). 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.
  The solid state of HEDP is crystal powder, suitable for usage in winter and freezing districts. Because of its high purity, it can be used as cleaning agent in electronic fields and as additives in daily chemicals
  
• Name: 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP)

• Molecular Weight: 206.02
• Synonyms: HEDP,corrosion inhibitor
• CAS No: 2809-21-4

• Pakage: 250kg/durm or 25kg/bag

  ITEM	crystal	liquid	liquid
  HEDP.H2O	98% Min	50%min	60%min
  HEDP	89% Max	--	--
  PO33-	0.8%Max	1.0%Max	1.0%Max
  PO43-	0.5% Max	0.6%Max	0.6% Max
  Chloride	0.01% Max	0.01% Max	0.01% Max
  PH	2	2	2
  Fe (mg·L-1)	5max	10max	10max
  Ca sequestration (mg CaCO3/g)	--	450min	500min
  Density (20℃ )g/cm3	--	1.36	1.4
  Colour APHA (Hazen)	--	10 max	10 max

  
  

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