Zinc Sulfate Heptahydrate White powder Used as raw material,for fiber,feed additive water treatment,etc. Zinc Sulfate HeptahydrateAppearance: White powder.Specification ... lithopone.It is also used in synthetic fiber industry, zinc plating, pesticides, mordant agent of printing and dyeing, ... feed additive, etc.If you are interested in zinc sulphate heptahydrate,pls send enquiry to us for more details ...