HEDP Na4 is also called HEDP Tetrasodium Salt. It is the tetrasodium salt of HEDP acid. Shandong IRO Water Treatment Co., Ltd mainly supplies two states (liquid & solid) products of HEDP Na4. For more details, please scroll down the mouse.

CAS No. 3794-83-0

Molecular Formula: C2H8O7P2

Molecular Weight: 293.96

HEDP Na4 Sructural Formula

Hydroxyethylidene Bisphosphonic Acid Tetrasodium Salt, IR-HEDP Na4, HEDP 4NaTetra sodium of 1-Hydroxyethylidene-1 1-Diphosphonic Acid

HEDP Na4, HEDP Tetrasodium Salt


HEDP Na4 is an organic phosphonic acid salt. This product is a sodium salt of excellent performance in inhibiting the formation of calcium carbonate and calcium sulphate. It is also an excellent chelating agent. HEDP Na4 can form the stable complex with Fe, Cu and Zn ions.

The solid HEDP Na4 is a white powder. It is soluble in water. This HEDP tetrasodium salt easily deliquescence. So it is suitable for use in winter and freezing districts. HEDP Na4 can dissolve the oxides on the metal surface. It has good scale and corrosion inhibition effect under 250℃.

This tetrasodium of HEDP is used as a stabilizer in cosmetic-dye industry. It also prevents swelling problems of the packages. HEDP Na4 provides chlorine resistance in swimming pools and removes stains from the centre (usage level 1 – 15 ppm active substance).

Item Index
Appearance colourless to yellowish transparent liquid white powder
Active content (HEDP) % 20.3 – 21.7 ≥ 56.0
Active content (HEDP Na4) % 29.0 – 31.0 ≥ 79.9
Phosphoric acid (as PO43- ) % 18.4 – 20.4 ≥ 52.0
Chloride (as Cl) ppm ≤100.0 ≤50.0
pH (1% solution) 10.0 – 12.0 11.0 – 12.0
Density (20℃)g/cm3 1.26 – 1.36
Fe,mg/L ≤ 20.0 ≤ 35.0
Colour APHA (Hazen) ≤ 150.0
Moisture % ≤ 15.0


  • Used as scale and corrosion inhibitor in circulating cool water system

  • Used as scale and corrosion inhibitor in medium and low pressure boiler

  • Used as scale and corrosion inhibitor in oil field water pipelines

  • Used as detergent for metal and nonmetal In light woven industry

  • Used as peroxide stabilizer and dye-fixing agent in dyeing industry

  • Used as chelating agent In non-cyanide electroplating

  • Used as water softener in soaps

Packing& Storage


Different HEDP Na4, different pack.


HEDP Na4 liquid: 200L plastic drum,IBC(1000L).

HEDP Na4 powder: 25kg/bag.

All above can be packed as customers’ requirements.


Ten months in room shady and dry place.

Safety Protection

Attention!Weak acidity, Avoid contact with eye and skin. Once contacted, flush with water.

HEDP Na4 (cas no.3794-83-0) Quotation.

Contact us immediately, you will receive the latest HEDP Na4 price.

Except information mentioned above, you will also get the HEDP Na4 SDS. You can see it on this page - SDS Download.
HEDP Na4 (cas no.3794-83-0) Quotation.