Physical state at 20 °C | Solid | Odour | Slight odor of sulfur dioxide |
Melting point/ Freezing point [°C] | 150°C | Solubility in water [% weight] | Soluble in water |
Colour | White crystalline | Density [g/cm3] | 1.48 |
Appearance | White crystalline powder |
Assay (as SO2; iodometric) | Min 58.5% |
Arsenic (As) | Max 0.0001% |
Chloride (Cl) | Max 0.02% |
Heavy metal (as Pb) | Max 0.001% |
Insoluble matter | Max 0.005% |
Iron (Fe) | Max 0.002% |