Form: crystalline powder Colour: white Odour: odourless Ph value: 2(aqueous solution at 80mg/l) Melting point: 165-168 Boiling point: 268(decomposition) Ignition temperature: 430 Flash point not available Explosive limits not available Vapour pressure low Density (20) 1.49 g/cm3 Solubility in Water (20) 83 g/l Water (70) 726 g/l Ethanol (20) soluble