1-Hydroxy Ethylidene-1,1-Diphosphonic(HEDP) CAS NO:2809-21-4
1-Hydroxy Ethylidene-1,1-Diphosphonic(HEDP)
Description: 1-Hydroxy Ethylidene-1,1-Diphosphonic(HEDP)
Physical and chemical property: crystal powder, suitable for usage in winter and freezing districts.
Molecular Formula: C2H8O7P2
CAS No:2809-21-4
UN No:3265
CLASS: 8.1
Specifications:
| Items | Index | |
| Appearance | Clear, Colorless to pale yellow aqueous solution | White crystal powder |
| Active content (HEDP)% | 60.0 min | 90.0 min |
| Active content (HEDP·H2O)% | 58-62 | 98.0 min |
| Phosphorous acid (as PO33-)% | 1.0 max | 0.8 max |
| Phosphoric acid (as PO43- )% | 0.6 max | 0.5 max |
| Chloride (as Cl-)% | 0.01 max | 0.01 max |
| pH (1% water solution) | 2.0 max | 2.0 max |
| Density (20℃)g/cm3 | 1.40 min | - |
| Fe, mg/L | 10.0 max | 5.0 max |
| Colour APHA (Hazen) | 10.0 max | - |
| Ca sequestration (mg CaCO3/g) | 500.0 min | |
Packed in 250kg plastic drum,20fcl=20mts.
Application: HEDP is used as scale inhibitor, deflocculant, sequestrant, water stabilizer in circulating cool water system, oil field and low-pressure boilers in fields such as electric power, chemical industry, metallurgy, fertilizer, etc under condition of high temperature and high pH value. HEDP is also used as detergent for metal and nonmetal. In dyeing industry, HEDP is used as peroxide stabilizer and dye-fixing agent; In non-cyanide electroplating, HEDP is used as chelating agent.
