Chemical Name

1-Hydroxy Ethylidene-1,1-Diphosphonic Acid

Commodity Name

HEDP

Molecular formula

C2 H8O 7P2    

Molecular weight

206.02

H.S.Code

29319000

CAS No.

2809- 21-4

Technical Specification

Tech grade

Appearance

Clear, Colorless to pale yellow aqueous solution

White crystal powder

Active content (HEDP)%

58.0-62.0

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-)%

0.02 max

0.01 max

pH (1% water solution)

2.0 max

2.0 max

Density  (20℃)g/cm3

1.40 min

-

Fe, mg/L

20.0 max

10.0 max

Ca sequestration (mg CaCO3/g)

500.0 min

-