Etidronic Acid CAS#2809-21-4

Chlorine-Free Eco-Friendly Formula:HEDP is a new-generation chlorine-free complexing agent, making it a safer and more environmentally friendly choice for electroplating and water treatment systems.


Excellent Corrosion and Scale InhibitionIt serves as an effective corrosion inhibitor and scale control agent, helping maintain stable water quality in circulating cooling water systems.


Efficient Water Treatment PerformanceAs a key organic phosphonic acid water treatment chemical, it provides long-lasting conditioning performance for industrial water systems.


Wide Industrial ApplicabilitySuitable for electroplating, cooling water circulation, and other industrial water treatment processes requiring reliable scale and corrosion control.


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Product Description

Products Description of Etidronic Acid CAS#2809-21-4

HEDP is a chlorine-free electroplating complexing agent and core water stabilizer for circulating cooling water, delivering excellent corrosion and scale inhibition.
As a typical organic polyphosphonic acid water treatment agent alongside ATMP and EDTMP, such chemicals were developed in the late 1960s and widely applied in the 1970s.


Product Application of Etidronic Acid CAS#2809-21-4

1-Hydroxyethylidenebis(phosphonic acid) inhibits protein tyrosine phosphatase and serves photographic uses. It aids bone health and treats osteoporosis and Paget’s disease.
Industrially, it prevents corrosion and scale in cooling water, oilfields, boilers and various industries, and prepares desalination antiscalants. It is also added into detergents, cosmetics and medicines.


Product Information

Parameters


Melting point198~199℃
Boiling point578.8±60.0 °C(Predicted)
density1.45 (60% aq.)
vapor pressure0Pa at 25℃
storage temp.Sealed in dry,Room Temperature
solubilityMethanol (Slightly), Water (Slightly)
pka1.35, 2.87, 7.03, 11.3(at 25℃)
formPowder
colorwhite
PHpH (1.7→100, 25℃) : 1.3~1.8
Water SolubilitySoluble in water.
Merck143863
BRN1789291
Stability:Stable. Incompatible with strong oxidizing agents.
InChIKeyDBVJJBKOTRCVKF-UHFFFAOYSA-N
LogP-3.5
CAS DataBase Reference2809-21-4(CAS DataBase Reference)
EPA Substance Registry SystemEtidronic acid (2809-21-4)


Safety Information


Hazard CodesXi,Xn
Risk Statements37/38-41-22
Safety Statements26-39
RIDADRUN 3265
WGK Germany2
RTECSSZ8562100
F10
TSCAYes
HazardClass8
PackingGroupII
HS Code29319090
Hazardous Substances Data2809-21-4(Hazardous Substances Data)
ToxicityLD50 oral in mouse: 1800mg/kg


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FAQ

Q1: Is Huafeng Chemical a manufacturer or a trader?
A: We are a professional service provider specializing in chemical foreign trade. Rather than being limited to the products of a single factory, we leverage the chemical industry cluster in Shandong Province to integrate production resources from multiple high-quality manufacturers. This allows us to offer a wide range of sourcing options—covering various product categories and origins—instead of simply pushing a single product. Furthermore, our core competitiveness lies in our professional foreign trade services (covering documentation, logistics, and regulatory compliance), ensuring a smooth and worry-free procurement process for you.


Q2: How is the security of my transaction guaranteed when working with Huafeng Chemical?
A: We strictly adhere to international trade rules (Incoterms® 2020) and accept various payment methods, such as Letters of Credit (L/C) and Telegraphic Transfers (T/T). For new clients, we support small-batch trial orders and can clearly define arbitration clauses and applicable laws within the contract. Additionally, we maintain a robust risk management system to help you mitigate common trade risks, such as exchange rate fluctuations, shipping delays, and document discrepancies.


Q3: Do you have experience serving clients in Russian-speaking regions?
A: Yes. We place great importance on the Russian-speaking market; our team includes Russian-speaking business professionals who are well-versed in the import regulations of Russia and the Eurasian Economic Union (EAEU). We understand the importance of EAC certification to clients in these regions and can assist with related compliance inquiries. We have established connections with chemical traders across various CIS countries and have gained valuable experience in specialized packaging and temperature-controlled shipping designed to withstand harsh local winter conditions.


Q4: How do you guarantee product quality?
A: We implement a strict supplier qualification and periodic audit system. A Certificate of Analysis (COA)—issued by the original manufacturer—is provided with every shipment. We also welcome pre-shipment inspections conducted by internationally recognized third-party agencies such as SGS, BV, or ITS. Should the test results fail to meet the standards specified in the contract, you have the right to reject the goods or request a replacement.

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