| Product name | 1-Hydroxyethylidene-1, 1- diphosphonic Acid |
| CAS NO. | 2809-21-4 |
| Content | 90%Min |
| EINECS NO. | 220-552-8 |
| UN NO. | 3261 |
| Molecular Formula | C2H8O7P2 |
| Molecular weight | 206.02 |
| Appearance | White crystalline powder |
| 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)% : ≥90.0% Phosphorous acid(as PO33-) %: ≤2.5 Phosphoric acid(as PO43-)%: ≤0.7 Chloride (as Cl-) %: ≤ 1.0 PH（1% solution）: ≤ 2.0 Iron,as Fe(ppm) : 35max Appearance：White crystalline powder |
| Package | 25kg/bag. Stored in cool and dry place. |
| Shelf Life | 1 year |
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