HEDP
1.CAS：2809-21-4
1-Hydroxy Ethylidene-1, 1-Diphosphonic Acid
Molecular formula: C2H8O7P2 Relative molecular mass: 206.02
2.Product Property
HEDP is an organophosphoric acid corrosion inhibitor. It can chelate with Fe, Cu, and Zn ions to form stable chelating compounds. It can dissolve the oxidized materials on these metals' surfaces. HEDP shows excellent scale and corrosion inhibition effects under temperature 250°C. HEDP has good chemical stability under high pH value, hard to be hydrolyzed, and hard to be decomposed under ordinary light and heat conditions
3.HEDP is used as scale and corrosion inhibition in circulating cool water system, oil field and low-pressure boilers in fields such as electric power, chemical industry, metallurgy, fertilizer, etc. In light woven industry, HEDP is used as detergent for metal and nonmetal. In dyeing industry, HEDP is used as peroxide stabilizer and dye-fixing agent
| Items | index | |
| Appearance | Colorless or light yellow clear liquid | White crystal powder |
| Active content (HEDP) | 58.0-62.0 | 90.0 min |
| Phosphorous acid (as PO33-)% | 2.0 max | 0.5 max |
| Phosphoric acid (asPO43- )% | 0.8 max | 0.5 max |
| Chloride (as Cl-)% | 0.01 max | 0.01 max |
| pH (1% solution) | 2 max | 2 max |
| Density (20°C)g/cm3 | 1.40 | - |
| Fe ion ppm | 10 max | 20 max |
| Colour APHA (Hazen) | 40 max | - |
