Description
Alum; Dialuminum sulfate octadecahydrate
| CAS | 7784-31-8 |
| Molecular Formula | AI2(SO4)3.18H2O |
| Molecular Weight | 666.42 |
| Shelf Life | 60 Months |
| Physical Properties | |||
| Physical State at 20 °C | Solid | Colour | White powder |
| pH Value | 3 – 4 | Melting Point/ Freezing Point [°C] | 86 °C |
| Solubility in Water [% weight] | Soluble in water | ||
| Specifications | |||
| Appearance | white crystalline powder | Assay ( As Ai2(So4)3.18H2O]; Complexometric) | 98 – 102% |
| Insoluble Matter | Max 0.005% | Chloride (Cl) | Max 0.001% |
| Ammonium (Nh4) | Max 0.002% | Copper (Cu) | Max 0.001% |
| Iron (Fe) | Max 0.002% | Heavy Metal (As Pb) | Max 0.001% |
| Calcium (Ca) | Max 0.01% | Magnesium (Mg) | Max 0.002% |
| Potassium (K) | Max 0.005% | Sodium (Na) | Max 0.02% |
| Substance Not Precipitated By Ammonia (As So4) | Max 0.2% | ||
| Dangerous Goods Information | |||
| UN Number | – | DG Class | – |
| Safety Information & Hazard Symbols | |
| Symbol | GHS05 |
| Signal Word | Danger |
| Hazard Statement | H318 |
| Precaution Statement | P280-P305 + P351 + P338 |



