Chemical formula: Na2HPO4·12H2O
Property: Colorless monoclinic crystal or white powder. Relative density 1.52, melting point 34.6℃, refractive rate 1.432 (20℃). Soluble in water, the aqueous solution is alkali, PH value of 1% aqueous solution is 8.8-9.2; insoluble in alcohol. Weathering in the air. Lose all the water of crystallization and turn to sodium pyrophosphate anhydrous if heated to 250℃.
Packing: PP-PE bag, Net weight 25kg or based on the customers’ requirements.
Executive standard: HG/T 2965-2009
Quality standard:
| Item | Index |
|---|---|
| Sodium hydrogen phosphate (Calc by Na2HPO4·12H2O), w/% ≥ | 97.0 |
| Sulfate (Calculated by SO4), w/% ≤ | 0.7 |
| Chloride (Calculated by Cl), w/% ≤ | 0.05 |
| Arsenic (As), w/% ≤ | 0.005 |
| Fluoride (Calculated by F), w/% ≤ | 0.05 |
| Fe, w/% ≤ | 0.05 |
| Water insoluble matter, w/% ≤ | 0.05 |
| PH value (10g/L solution) | 9.0±0.2 |
Usage: Used as fire-proofing agent for fabric, wood and paper, as glaze, welding flux and used in electroplating, etc.
Properation: Prepared by sodium carbonate and phosphoric acid.
Remarks: Weathering in the air, lose water of crystallization and turn to anhydrous substance at 100℃. Decompose to sodium pyrophosphate anhydrous at 250℃.
Transportation and storage: Avoid rain and sunlight during the transporation. Please keep in dry and ventilated place and equipped with under layer to prevent damp.