HEDP Na4, HEDP Tetrasodium Salt


HEDP Na4 is the tetrasodium salt of HEDP. This HEDP tetrasodium salt 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 tetra-sodium 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 a 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 the woven industry, this HEDP phosphonate 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.

CAS No.:


Molecular Formula:


Molecular Weight:


Structure Formula:



AppearanceWhite powderColorless to yellowish transparent liquid
Active content (HEDP), %56.0 Min.20.3~21.7
Active content (HEDP Na4), %79.9 Min.29.0~31.0
Total phosphoric acid (as PO43-), %52.0 Min.18.4~20.4
Fe, mg/L35.0 Max.20.0 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.

Packing and storage:

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

200L plastic drum 1000L IBC

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

weaved plastic bag

Safety Protection:

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