... fiber,feed additive water treatment,etc. Zinc Sulphate HeptahydrateAppearance: White powder.Specification:Industrial gradeZinc sulphate HeptahydratePurity≥98%Zinc(Zn)≥35.5%Water ... and feed additive, etc.If you are interested in zinc sulphate mono/hepta,pls send enquiry to us for more details ...