Home > Products > HEDP Series > Tetra sodium of 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP·Na4)
Tetra sodium of 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP·Na4)
Tetra sodium of 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP·Na4)

CAS No. 29329-71-3 (x-Na), 3794-83-0 (4-Na) Dequest 2016/2016DG
Molecular Formula: C2H4O7P2Na4 Molecular weight: 294
Structural Formula:

Dequest 2016 is the sodium salt of Dequest 2010, HEDP·Na4 is an good scale inhibitor for calcium carbonate, it can be used in low pressure boiler water system, circulating water system, industrial and municipal cleaning water system and swimming pool.
The solid HEDP·Na4 is white powder, soluble in water, easily deliquescence, suitable for use in winter and freezing districts. It is a kind of organophorphonic acid scale and corrosion inhibitor, can form stable complex with Fe, Cu and Zn ions, it can dissolve the oxides on metal surface, it has good scale and corrosion inhibition effect under 250℃.
HEDP•Na4 is widely used in circulating cool water system, medium and low pressure boiler, oil field water pipelines as scale and corrosion inhibitor in fields such as electric power, chemical industry, metallurgy, fertilizer, etc.. In light woven industry, HEDP•Na4 is used as detergent for metal and nonmetal. In dyeing industry, HEDP•Na4 is used as peroxide stabilizer and dye-fixing agent; In non-cyanide electroplating, HEDP•Na4 is used as chelating agent.


Items Index
Appearance White powder Colorless to light yellow transparent liquid
Active component(HEDP)% 56.0min 20.3-21.7
Active component(HEDP•Na4)% 79.9min 29.0-31.0
Total phosphoric acid (as PO43-) % 52.0-54.0 18.4-20.4
Fe, ppm 35.0max 20max
Dry weight loss,% 15max --
density(20℃)g/cm3 -- 1.26-1.36
PH 11.0-12.0 (1% water solution) 10.0-12.0 (as it)

Package and Storage:
For liquid: Normally In 250kg net Plastic Drum, IBC drum can also be used as required.
For solid: inner liner polyethylene (PE) bag, outer plastic woven bag, or confirmed by clients. Storage for ten months in room shady and dry place.
Safety Protection:
Weak alkine, Avoid contact with eye and skin, once contacted, flush with water.

Contact Details
Changzhou Yao's Tongde Chemical
Co., Ltd.
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