Assay (Dihydrate): ≥ 98.0% (99.0% min. for high grade)
Appearance: White crystalline powder / lumps
SO₂ Content (dried basis): 45.5% – 54.5%
Melting Point: ~120 °C (decomposes)
pH (1% aq. soln.): 8.0 – 9.5
Iron (Fe): ≤ 0.01%
Water-insoluble matter: ≤ 0.1%
Heavy metals (as Pb): ≤ 0.001%
Loss on drying: ≤ 0.5%
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