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 |
Appearance | A white crystalline powder |
Assay ( as AI2(SO4)3.18H2O]; complexometric) | 98 – 102% |
Insoluble matter | Max 0.005% |
Reaction | Min pH 2.5 |
Chloride (Cl) | Max 0.001% |
Loss on drying (at 105°C) | 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% |