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1-Hydroxyethylidene-1 (HEDP)

HEDP Chemical Powder
Fengbai 1-Hydroxyethylidene-1
Fengbai HEDP Chemical for Sale
HEDP Water Treatment Supplier
HEDP Chemical Powder Fengbai 1-Hydroxyethylidene-1 Fengbai HEDP Chemical for Sale HEDP Water Treatment Supplier
  • Product Name: 1-Hydroxyethylidene-1
  • Synonyms: 1-diphosphonic acid
  • Appearance: White powder or Liquid
  • PH (1% solution): ≤2.0
  • Chloride (as Cl-) ppm: ≤100.0
  • CAS No: 2809-21-4
  • MF: TC2H8O7P2
  • HS Code: 29310000

1-Hydroxyethylidene-1 (HEDP) is a white crystalline powder or light yellow transparent liquid with a melting point of 198-199℃. Soluble in water, methanol, and ethanol. It has highly acidic and corrosive. It is an organic phosphonic acid scale inhibitor and corrosion inhibitor, which can form stable complexes with iron, copper, zinc and other metal ions and dissolve oxides on the metal surface. Hedp chemical can still play a good role in corrosion inhibition and scale inhibition at 250℃ and is very stable at high pH. It is better than other organic phosphonates in acid and alkali resistance and chlorine oxidation resistance. It can form a six-ring chelate with metal ions in water, especially calcium ions, therefore it has good scale inhibition effect and obvious solubilization effect. When used with other water treatment chemicals, it shows an excellent synergistic effect. Hedp powder belongs to high purity products, suitable for winter cold areas; Especially suitable for cleaning agents and daily chemical additive in the electronic industry.


Clear, Colorless to pale yellow aqueous solution

White crystal powder

Active content (HEDP)%


90.0 min

Active content (HEDP·H2O)%

98.0 min

Phosphorous acid (as POR3RP3P)%

1.0 max


Phosphoric acid  (as POR4RP3-P )%

0.6 max

0.5 max

Chloride (as Cl-) ppm

100.0 max


pH (1% solution)

2.0 max

2.0 max

Density  (20℃)g/cm3



10.0 max

5.0 max

Colour APHA (Hazen)

30.0 max

Ca sequestration (mg CaCO3/g)

500.0 min

HEDP Applications

1-Hydroxyethylidene-1 (HEDP) is widely used in power, chemical industry, metallurgy, chemical fertilizer and other industrial circulating cooling water system; Used as scale and corrosion inhibition agent in low pressure boiler, oil field water injection and oil pipeline; In light textile industry, it can be used as cleaning agent for metal and nonmetal, peroxide stabilizer and color fixing agent for bleaching and dyeing industry; As complexing agent for cyanide-free electroplating industry, and carrying agent for radioactive elements in pharmaceutical industry. Welcome to contact us to get price list.

1.As the main material of cyanide-free electroplating, HEDP phosphonate can be prepared into cyanide-free electroplating copper solution and directly electroplating copper layer on sodium iron. Its binding force is good, which can make the coating smooth and good in color. In addition, before electroplating, dip the plating part in 1%~2% hedp solution, so that the electroplating part into the activation state and then electroplating can improve the effect.

2.Hedp water treatment is used as the main agent to stabilize water quality in the circulating cooling water system and plays a role as corrosion inhibition and scale inhibition. This product is one of the organic polyphosphoric acid water treatment agents. Compared with inorganic polyphosphate, organic polyphosphoric acid has good chemical stability, not easy to hydrolyze, higher resistance to temperature, low dose, and anti-corrosion properties.

3.1-Hydroxyethylidene-1 (HEDP) is a scale inhibitor and corrosion inhibitor for boilers and heat exchangers, a complexing agent for cyanide-free electroplating, a chelating agent for soap, and a cleaning agent for metals and nonmetals. As a water treatment agent, hedp chemical has a stable structure and is not easy to hydrolyze. It is a kind of cathodic corrosion inhibitor, and when used in combination with other water treatment agents, it shows an ideal synergistic effect. It has excellent chelating energy for many metal ions, such as calcium, magnesium, copper, and zinc, and even has good deactivation effect on inorganic salts of these metals, such as CaSO4, CaCO3, and MgSiO3. Therefore, it is widely used in water treatment technology.

4.As a scale inhibitor, HEDP acid is usually used together with a polyhydroxy acid scale inhibitor. It also can be used as a bleaching and dyeing industry fixing agent, hydrogen peroxide stabilizer.

Where to buy 1-Hydroxyethylidene-1 (HEDP)

  • Henan Fengbai Industrial Co., Ltd. is a water treatment products research and development company. The company has strong technical force, has its own research and development team, can provide users with high-quality products and perfect technical services.
  • Fengbai always puts product quality first. We have passed ISO 9001, USDA organic certification and kosher certification. The company has its own production base, sufficient product inventory, can quickly delivery, save your time.
  • With more than 15 years of production and sales experience, we always provide customers with the most professional service. We have been constantly improving the trading process to make the transaction more simple and quick.
  • With excellent quality, preferential prices, fast delivery, first-class service, fengbai has won the trust and praise of customers. Fengbai hedp chemical has been sold to many countries and regions. You are welcome to make an inquiry at any time.

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