1. Effective Water Quality Maintenance: HEDP prevents corrosion and scaling in circulating cooling water systems, ensuring stable water quality.
2. Chlorine-Free: As a chlorine-free complexing agent, it offers an environmentally friendly alternative to traditional water treatment methods.
3. Stable and Reliable: The product remains stable and is resistant to decomposition, providing long-lasting efficacy in industrial applications.
4. Versatile in Industrial Use: HEDP is part of a new category of organic polyphosphonic acid-free water treatment agents, suitable for various industrial and water conditioning applications.
Hydroxyethylidene diphosphonic acid (HEDP) is an advanced chlorine-free electroplating complexing agent. It is primarily used to maintain stable water quality in circulating cooling water systems, where it serves to prevent corrosion and scaling. This product is classified as one of the organic polyphosphonic acid-free water tablet conditioners.
Other similar products manufactured in China include aminotrimethylenephosphonic acid (ATMP): [CH2PO(OH)2]3N and ethyl acetate diaminetetramethylenephosphonic acid (EDTMP), among others. Organic polyphosphonic acids emerged as a new category of water treatment agents in the late 1960s and were widely recognized by the 1970s for their efficacy in various industrial applications.
| Etidronic Acid Chemical Properties |
| Melting point | 198~199℃ |
| Boiling point | 578.8±60.0 °C(Predicted) |
| density | 1.45 (60% aq.) |
| vapor pressure | 0Pa at 25℃ |
| storage temp. | Sealed in dry,Room Temperature |
| solubility | Methanol (Slightly), Water (Slightly) |
| pka | 1.35, 2.87, 7.03, 11.3(at 25℃) |
| form | Powder |
| color | white |
| PH | pH (1.7→100, 25℃) : 1.3～1.8 |
| Water Solubility | Soluble in water. |
| Merck | 14,3863 |
| BRN | 1789291 |
| Stability: | Stable. Incompatible with strong oxidizing agents. |
| InChIKey | DBVJJBKOTRCVKF-UHFFFAOYSA-N |
| LogP | -3.5 |
| CAS DataBase Reference | 2809-21-4(CAS DataBase Reference) |
| EPA Substance Registry System | Etidronic acid (2809-21-4) |
Safety Information
| Hazard Codes | Xi,Xn |
| Risk Statements | 37/38-41-22 |
| Safety Statements | 26-39 |
| RIDADR | UN 3265 |
| WGK Germany | 2 |
| RTECS | SZ8562100 |
| F | 10 |
| TSCA | Yes |
| HazardClass | 8 |
| PackingGroup | II |
| HS Code | 29319090 |
| Hazardous Substances Data | 2809-21-4(Hazardous Substances Data) |
| Toxicity | LD50 oral in mouse: 1800mg/kg |
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