Heptahydrate zinc sulphate use in agriculture. Lower heavy metal level. Other name:zinc sulphate hepta. Real manufacturer of zinc sulphate heptahydrate. 1.lower heavy metal level ,. 2.zn>21%. 3.applicaton:trace element fertilizer , industry. 4.quality :iso9001:2008. Key words:zinc sluphate heptahydrate ,zinc sulphate hepta ,zinc sulphate. Description. Zinc sulphate heptahydrate granular. Molecular formula :znso4.7h2o. Cas:7446-19-17. Hs code :2833293000. Apperance :white granular. Qualities are conformed :gb:t 666-1993. Zinc sulphate( crystalline powder). Items. Unit. Specification. Zn. %min. 21. Pb. (ppm)max. 10. As. (ppm)max. 5. Cd. (ppm)max. 10. Zinc sulphate(granular). Items. Unit. Specification. Zn. %min. 21. Pb. (ppm)max. 10. As. (ppm)max. 5. Cd. (ppm)max. 10. Granule size. 0.5-1mm/1-2mm/2-4mm. Packing. Net weight 25kgs,  per each plastic woven bag, or 1100kgs. To 1350kgs per each package,or according to client request. Uses. Znso4 is mainly used as raw made of ... For the production of lithophone. And zinc salts.it is also used in synthetic fiber industry,zinc plating,. Pesticides,flotation,fungicide and water,purification.in agriculture,. It is mainly used as feed additive and trace element fertilizer,etc. Storage. Dry and hermetic. About us. Xiangtan fenghe biotechnology co.ltd is a chief manufacturer of zinc sulphate granular, specializing in zinc product for fertilizer.