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1-Hydroxy Ethylidene-1,1-Diphosphonic(HEDP)
Jun 06, 2018

Description: 1-Hydroxy Ethylidene-1,1-Diphosphonic(HEDP)

Physical and chemical property: crystal powder, suitable for usage in winter and freezing districts.

Molecular Formula: C2H8O7P2

CAS No:2809-21-4

UN No:3265

CLASS: 8.1





Clear, Colorless to pale yellow aqueous   solution

White crystal powder

Active content (HEDP)%

60.0 min

90.0 min

Active content (HEDP·H2O)%


98.0 min

Phosphorous acid (as PO33-)%

1.0 max

0.8 max

Phosphoric acid  (as PO43- )%

0.6 max

0.5 max

Chloride (as Cl-)%

0.01 max

0.01 max

pH (1% water solution)

2.0 max

2.0 max

Density  (20℃)g/cm3

1.40 min


Fe, mg/L

10.0 max

5.0 max

Colour APHA (Hazen)

10.0 max


Ca sequestration (mg CaCO3/g)

500.0 min

Packed in 250kg plastic drum,20fcl=20mts.

Application: HEDP is used as scale inhibitor, deflocculant, sequestrant, water stabilizer in circulating cool water system, oil field and low-pressure boilers in fields such as electric power, chemical industry, metallurgy, fertilizer, etc under condition of high temperature and high pH value. HEDP is also used as detergent for metal and nonmetal. In dyeing industry, HEDP is used as peroxide stabilizer and dye-fixing agent; In non-cyanide electroplating, HEDP is used as chelating agent.

Storage and transportation: