Product Details


HEDP•Na4(Tetra Sodium Salt of 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid)

HEDP•Na4(Tetra Sodium Salt of 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid) is a high-quality product perfect for companies looking to wholesale in bulk. It is used as an acid scavenger and corrosion inhibitor in water treatment and metalworking fluids and as a sequestering agent in laundry detergents. It is made in China and has the highest quality standards. Contact us today to learn more about this product and how it can benefit your business.

Product Description

CAS NO.3794-83-0 (4-Na)

Dequest 2016

29329-71-3 (x-Na)

Dequest 2016DG

Synonyms: Tetrasodium etidronate

Molecular Formula: C2H4O7P2Na4

Molecular weight: 294

Structural Formula:


HEDP•Na4 Properties and Use:

HEDP•Na4 is the sodium salt of HEDP, commonly utilized as a scale inhibitor for calcium carbonate in low-pressure boiler water systems, circulating water systems, industrial and municipal cleaning water systems, and swimming pools. The solid form of this organophosphorus acid appears as a white powder, which is both soluble in water and easily deliquescent, facilitating convenient transport. Additionally, it is suitable for use even in winter or freezing climates. This acid scale corrosion inhibitor can form a stable complex with Fe, Cu, and Zn ions while effectively dissolving oxides on metal surfaces. It demonstrates the superior scale and corrosion inhibition effects even under temperatures such as 250℃.


AppearanceWhite powderColorless to yellowish transparent liquid
Active content (HEDP)% ≥ 56.020.3-21.7
Active content (HEDP•Na4)% ≥ 79.929.0-31.0
Fe3+ μg/g ≤3520
Moisture,% ≤15--
Density (20℃)g/cm3 --1.26-1.36
PH (1% water solution)11.0-12.0(1%aqueous solution)10.0-12.0( stoste)

Application scope and method of use:

HEDP•Na4 has extensive applications in electric power, the chemical industry, metallurgy, fertilizer, circulating cool water systems, and low to medium-pressure boilers and oil field pipelines as a scale and corrosion inhibitor. Additionally, it can be employed as a detergent for both metal and nonmetal within the light woven industry. Furthermore, this organophosphorus acid shows exceptional performance as a peroxide stabilizer and dye-fixing agent within the dyeing industry and an effective chela-acting agent in non-cyanide electroplating processes. It is also commonly used as an additive within daily chemicals.

HEDP•Na4 Package and Storage:

Liquid: plastic drum,30kg or 250kg, Solid: 25kg/bag, customers’ requirement. Storage for ten months in a shady room and dry place

Safety Protection:

HEDP•Na4 Weak acidity, Avoid contact with eye and skin; once contacted, flush with water.

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