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1.Chemical name: 90% HEDP powder Hydroxy Ethylidene Diphosphonic Acid
2.Abbreviation: HEDP,Etidronic acid
3.Molecular Formula: C2H8O7P2
4.Molecular Weight: 206
5.CAS NO 2809-21-4
   HS Code 2931901990

1.Properties:
HEDP White Powder 90% 2809-21-4is 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 White Powder 90% 2809-21-4shows excellent scale and corrosion inhibition effects under temperature 250°C.

2.Specification of HEDP White Powder 90%:
Appearance          White Crystal Powder
Active Content (HEDP)%    :     90 Min
Phosphorous Acid (as PO33-)%  :   0.5 Max
Phosphoric Acid  (asPO43- )%    :    0.5 Max
Chloride (as Cl-)%   :    0.1 Max
PH (1% Solution)  :   2 Max

3.Usage:
1. HEDP White Powder 90% 2809-21-4 is used as scale and corrosion inhibition in circulating cool water system, oil field and low-pressure boilers in fields such as electric power, chemical industry, metallurgy, fertilizer, etc.

2. In light woven industry, HEDP White Powder 90% 2809-21-4is used as detergent for metal and nonmetal.

3. In dyeing industry, HEDP White Powder 90% 2809-21-4is used as peroxide stabilizer and dye-fixing agent.

4. In non-cyanide electroplating, HEDP White Powder 90% 2809-21-4is 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 White Powder90% 2809-21-4is used together with polycarboxylic acid.

4.Package and Storage:

HEDP White Powder 90%: 25kg inner liner polyethylene (PE) bag, outer plastic woven bag, or confirmed by clients.

Storage for ten months in shady room  and dry place.