... :1) Stannous sulphate SnSO42) Appearance: white crystal3) Assay: 99.2% min.4) Fe: 0.008% max.5) As ... :1) Intermediateds for nickel plating, zinc plating and copper plating and relevantraw materials and equipment for plating:a) ... PS, PN, PPS-OH 40% and 45%, PPSb) For copper plating: DPS, HI (2-mercapto thiazoline), SPS, UPS, ZPS ... )d) Stannous fluoride Stannous Sulphate white crystal 99.2% min.