SP/ SPS (C6H12O6S4Na2) Bis-(sodium sulfopropyl)-disulfide CAS No. 27206-35-5 Appearance: White or light yellow solid Assay: ≥85%, 95% Application: It is used as brightener in acidic copper baths for decorative and functional deposits(i.e. Printed circuit boards), it is functionally compatible with most components of typical copper bath formulations, such as non-ionic surfactants, polymeric amines and other mercapto compounds. An additional combination with dyestuffs is also possible. Very good results are obtained if used together with DPS And EXP2887. We may produce and export the other Electroplating intermediate of Cu such as : DPS, SPS 85%/90%/97% , MPS, ZPS, UPS, 2-mercapto-benzimidazole , ethenethiourea , 2-mercapto thiazoline, EDTP 75%/95%/98% ,JPH Pls visit to get more product details thanks contact : Candy