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HEDP Na, HEDP Sodium Salt


HEDP Na is an organic phosphonic acid corrosion inhibitor. HEDP sodium salt can chelate with Fe, Cu, and Zn ions. HEDP sodium can dissolve the oxidized materials. It has good scale and corrosion inhibition effects even under 250°C.

HEDP Na is stable under high pH value, not easy to be hydrolyzed, not easy to be decomposed under normal light and thermal condition. It’s acid/alkaline and chloride oxidation tolerance are better than that of other organic phosphonic acids.

HEDP Na can form six-ring chelating compounds with metal ions in a water system, Ca2+ in particular. HEDP sodium salt has good scale inhibition effects and obvious dissolution threshold effects. When used with other water treatment agents, the synergistic effects are better.

HEDP Na is suitable for acidic scale inhibitor and detergent can be used for metal surface treatment.

CAS No.: 29329-71-3

Molecular Formula: C2H7O7P2Na

Molecular Weight: 228

Structural Formula:



AppearanceColorless or yellowish transparent liquid
Active content (HEDP), %19.0-21.0
Fe, mg/L20 Max.
pH (1% water solution)2.3-2.9
Density (20℃), g/cm31.11-1.21


HEDP Na is used in circulating cool water system, medium, and low-pressure boiler, oil field water pipelines. As the scale and corrosion inhibitor, HEDP sodium has a good performance in fields. Such as power plant, chemical industry, metallurgy, fertilizer, etc..

In the woven industry, HEDP sodium salt is used as detergent for metal and nonmetal. In the dyeing industry, this product is used as a peroxide stabilizer and dye-fixing agent. In non-cyanide electroplating, this product is used as a chelating agent.

When used as a scale inhibitor, the dosage 2-20 mg/L is preferred. When used as a corrosion inhibitor, the dosage 20-100mg/L is preferred. When used as a cleaning agent, the dosage 1000-2000 mg/L is preferred. Usually, HEDP Na is used together with the polycarboxylic acid.

Package and Storage:

200L plastic drum, IBC(1000L), customers’ requirements. Storage for ten months in a shady room and dry place.

Safety Protection:

Acidity. Avoid contact with eye and skin. Once contacted, flush with water.