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