Sodium Thiosulfate used in fixers, plating, leather, reductant, dechlorinating agent, sulfur dyeing agent... Sodium ThiosulfateMolecular Formula : Na2S2O2*5H2OMolecular Weight : 248.17Properties : monoclinic crystal Melting point : 40 ~ 45Relative Density : 1.729Packing : in woven PE bag with PP bag inside, net weight of 25kg/bag or 50kg/bagUses : used in fixers, plating, leather, reductant, ...