HEDP Na4, HEDP Tetrasodium Salt 2019-09-11T03:35:20+00:00

Project Description

CAS No.: 29329-71-3 (x-Na), 3794-83-0 (4-Na)

Molecular Formula: C2H4O7P2Na4

Molecular Weight: 294

Structural Formula:



HEDP Na4 is the tetrasodium salt of HEDP. HEDP Na4 is a good scale inhibitor for calcium carbonate. It can be used in a low-pressure boiler water system, circulating water system, industrial and municipal cleaning water system and swimming pool.

The solid HEDP Na4 is a white powder. It can soluble in water and easily deliquescence. HEDP tetrasodium is suitable for use in winter and freezing districts. It is a kind of organophorphonic acid scale and corrosion inhibitor.  HEDP tetrasodium salt can form a stable complex with Fe, Cu and Zn ions. HEDP Na4 can dissolve the oxides on the metal surface. It has good scale and corrosion inhibition effect under 250°C.

HEDP Na4 is widely used in circulating cool water system, medium and low-pressure boiler, oil field water pipelines. As the scale and corrosion inhibitor,  HEDP tetrasodium is used in fields such as electric power, chemical industry, metallurgy, fertilizer, etc.. In woven industry, HEDP Na4 is used as detergent for metal and nonmetal. In the dyeing industry, HEDP tetrasodium salt is used as a peroxide stabilizer and dye-fixing agent. In non-cyanide electroplating, HEDP tetrasodium is used as a chelating agent.


AppearanceWhite powderColorless to yellowish transparent liquid
Active content (HEDP)%56.0 min20.3-21.7
Active content (HEDP•Na4)%79.9 min29.0-31.0
Total phosphoric acid (as PO43-) %52.0 min18.4-20.4
Fe,mg/L35.0 max20.0 max
Moisture,%15 max
Density (20℃)g/cm31.26-1.36
PH11.0-12.0 (1% water solution)10.0-12.0 (as it)
Phosphorous Acid %1.0 max
Colour APHA50.0 max

Package and Storage:

Liquid: 200L plastic drum, IBC (1000L), customers’ requirement.

Solid: 25 kg/bag,customers’ requirement. Storage for ten months in a shady room and dry place.

Safety Protection:

Weak acidity, avoid contact with eye and skin. Once contacted, flush with water.