CAS No.: 29329-71-3 EINECS No.: 249-559-4
Molecular Formula: C2H7O7P2Na Molecular Weight: 228
RIDADR: UN 3265 8/PG III
HEDP•Na is a kind of scale and corrosion inhibitor which belongs to organic phosphonic acid. It can form stable complexes with iron, copper, zinc and other metal ions, and can also dissolve the metal surface oxide. Under 250 ℃ condition, HEDP•Na can still play a good corrosion and scale inhibition effect.
HEDP•Na has good chemical stability under high pH value, hard to be hydrolyzed, and hard to be decomposed under ordinary light and heat conditions. Its acid/alkali and chlorine oxidation tolerance show better than that of other organic phosphonic acid (salt) acids (salt).
HEDP•Na can react with metal ions in water system to form hexa-element chelating complex, especially with calcium ions. Therefore, HEDP•Na has good anti-scale and visible threshold effects. When used in combination with other water treatment chemicals, it shows ideal synergistic effects.
Colorless or yellowish transparent liquid
Active content (HEDP)%
PH (1% water solution)
Density (20℃) g/cm3
HEDP•Na is widely used as scale and corrosion inhibitor in industrial circulating cooling water systems of electric power, chemical industry, metallurgy, chemical fertilizer, and also in medium or low pressure boilers, oilfield water injection and oil pipeline.
Besides these applications, HEDP•Na can also be used as cleaning agent of metal and nonmetal in the textile industry, as peroxide stabilizer and fixing agent in bleaching and dyeing industry, as complexing agent in cyanide free electroplating industry, as the carrier of radioactive elements in pharmaceutical industry, and so on.
When used as scale inhibitor, the dosage 2-20mg/L is preferred, when used as corrosion inhibitor, the dosage 20-100mg/L is preferred, when used as cleaning agent, the dosage 1000-2000mg/L is preferred.
Usually, HEDP•Na is used together with polycarboxylic acid.
Package and Storage:
Normally in 200L HDPE drum, 1000L IBC, or customers’ requirement.
Storage for ten months in shady room and dry place.
Acidity, Avoid contact with eye and skin, once contacted, flush with water.
1-Hydroxyethanediphosphonic acid, sodium salt;
Hydroxyethylidene diphosphonic acid, sodium salt;
1-Hydroxyethane-1,1-diphosphonic acid sodium salt;
Phosphonic acid, (1-hydroxyethylidene)bis, sodium salt;
Mono-sodium salt of 1-hydroxy ethylidene-1,1-diphosphonic acid;
Sodium 1-hydroxyethylidene diphosphonate;