Description Catalogue Number 101208 Product Information CAS number 7783-18-8 EC number 231-982-0 Hill Formula H₈N₂O₃S₂ Chemical formula (NH₄)₂S₂O₃ Molar Mass 148.19 g/mol HS Code 2832 30 00 Applications Application Ammonium thiosulfate 98%+. CAS No. 7783-18-8, EC Number 231-982-0. Physicochemical Information Density 1.64 g/cm3 (23 °C) Melting Point 150 °C (decomposition) pH value 6.0 - 6.5 (50 g/l, H₂O, 20 °C) Bulk density 650 kg/m3 Solubility 1800 g/l Toxicological Information LD 50 oral LD50 Rat 2890 mg/kg Safety Information according to GHS Storage class 10 - 13 Other liquids and solids WGK WGK 1 slightly water endangering Disposal 14 Inorganic salts: Container I. Neutral solutions of the these salts: Container D. Before placing in Container D, check the pH with pH-Universal indicator strips (Item No. 109535). Storage and Shipping Information Storage Store at +5°C to +30°C. Transport Information Declaration (railroad and road) ADR, RID Kein Gefahrgut Declaration (transport by air) IATA-DGR No Dangerous Good Declaration (transport by sea) IMDG-Code No Dangerous Good Specifications Assay (iodometric) ≥ 98.0 % pH-value (5 %; water) 5.0 - 7.0 Chloride (Cl) ≤ 0.05 % Sulfate and sulphite (as SO₄) ≤ 1 % Sulphide (S) ≤ 0.001 % Heavy metals (as Pb) ≤ 0.002 % Ca (Calcium) ≤ 0.005 % Fe (Iron) ≤ 0.002 % Na (Sodium) ≤ 2 %