Grade: ACS, Reag. Ph Eur CAS No.: 5808-22-0 pH: 3.6 (10 g/l, H2O, 20°C) Solubility: 170 g/l (20°C) Melting Point: >300°C Molar Mass: 400.30 g/mol Bulk Density: 780 kg/m3 Hill Formula: C10H6Na2O8S2 * 2 H2O