CAS: 27206-35-5 Trade name: SPS(SP) Chemical name: Bis-(sodium sulfopropyl)-disulfide Other name: SPS 1-Propanesulfonicacid,3,3dithiobis-,disodium salt 3,3dithiobis-1-propanesulfonicacidisodiumsalt MF: C6H12Na2O6S4 Mw: 354.4 EINECS: 248-324-3 HS:2930909090 Molecular formula: C6H12O6S4(Na)2 Assay: 90% Appearance: White or yellowish powder Application: As a brightening agent for acid copper baths for decorative and functional deposits, it is functionally compatible with most components of typical copper bath formulation such as non-ionic surfactants, polymeric amines and other mercapto compounds.