... 5,good after-sale service 1, Technical indexItemIndexAppearancewhite crystalline powderAssay, %99.0Free acid, %≤0.01Cl,%≤0.00004Heavy metals (Pb),%≤0.0005Fe,%≤0 ... ).Others: Also used in food, photo, storage battery industry, sulfuric acid industry, fat and oil industry.Storage: Sealed tightly, kept in ... not in use.6 Wash thoroughly after handling. Soduim Persulfate(99.0%)/Chemical for Industrial