| Product name | 1-Hydroxyethylidene-1, 1- diphosphonic Acid |
| CAS NO. | 2809-21-4 |
| Content | 58-62% |
| EINECS NO. | 220-552-8 |
| UN NO. | 3265 |
| Molecular Formula | C2H8O7P2 |
| Molecular weight | 206.02 |
| Appearance | Colorless to pale yellow transparent liquid |
| Product Grade | Industrial |
| Structural Formula |  |
| Description & Application | A scale and synergistic corrosion inhibitor for iron rust and mineral scale from pipes of cooling circulation water units and boilers; Metal chelate agent for color fixing and bleaching in textile; Complexing agent for electron plate and scale cleaning agent for metals. |
| Safety Protection | Acidity, avoid contact with eye and skin, once contacted, flush with water. |
| Specification | Active content (as acid)% : 58.0-62.0 Phosphorous acid(as PO33-) %：≤2.5 Phosphoric acid(as PO43-)%: ≤0.7 Chloride (as Cl-) %: ≤0.50 PH（1% solution）: ≤ 2.0 Density(20℃) g/cm3 : 1.39 – 1.49 Calcium sequestration mg/g: ≥500 Appearance：Colorless to pale yellow transparent liquid |
| Package | 200L Drum, 1000L IBC or Bulk. Stored in cool and dry place. |
| Shelf Life | 1 year |
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