... 4,Use for Agriculture Grade 1,Product name Zinc Sulphate Hepta2,Purity Zn 22% min3,Appearance white powder4, ... Use for Agriculture GradeSpecificationsZinc Sulphate HeptaZn 22% minPb 0.002% maxAs 0.002% ... products. Our main business scope covers Chrome Oxide Green,Sodium Bichromate,Chrome Acid,Magnesium Sulphate,Sodium Metabisulphate,Kieserite,Magnesium Carbonate Light ...