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HS-311 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP)

Product name

HS-311 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP)

CAS No.

2809-21-4

Alias

HEDPA

Molecular Formula

C₂H₈O₇P₂

Molecular Weight

206.02

Structural Formula

Properties & Use

It is an organic phosphoric acid series antiincrustation corrosion inhibitor. It has good stability in high pH-value conditions; has good resistance to acids/alkali and oxidation.
HEDP is widely used for electrical power, chemical engineering, metallurgy and chemical fertilizer industries.

Specifications
Conform to HG/T 3537-1999

Item	Details
Item	HG/T 3537-1999
Appearance	colorless or light yellow transparent liquid	white powdered solid
Active ingredient (HEDP)%≥	50.0 60.0	89
Phosphorous acid（PO₃³-）% ≤	2.0 2.0	0.8
Phosphoric acid （以PO₄³-）% ≤	0.8 0.8	0.5
Chloride （Cl-）% ≤	0.01 0.01	0.01
pH-value (1%aqueous solution) ≤	2 2	2
Density（20℃）g/cm³≥	1.34 1.40	——
Cacium chelating value mg/g	450 500	——
Iron (²⁺) content mg/L ≤	10 10	5
Active ingredient (HEDP H₂O)%≥	——	98

Packing & Storage

HEDP liquid: in plastic drum, 30kg/drum or 250Kg; HEDP solid: in plastic woven bag lined with PE film, net wt.25kg/bag, or upon users' demand. Stored in cool and draugthty place. Shelf life is 12 months.

Safety Protection

Avoid contact with skin and eyes; wash with plenty of water.

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