Our works is one of the biggest manufactures of zinc sulphate and indium ingots in China which has its own rights of Import & Export ,with annual output of 20000MT for zinc sulphate and 40 MT for indium .For you reference ,the following is our products&＃39;specifications. Zinc Sulphate Heptahydrate: Purity (ZnSO4.7H2O):98%min zinc(Zn):22%minPb:0.002%maxCd:0.002%maxZinc Sulphate MoNo(Power/particulate): Purity (ZnSO4.7H2O):98%min zinc(Zn):35%min Pb:0.002%maxCd:0.002%maxIf you have any interests in our products ,please inform us at your convenience.Your early reply will be appreciated!wendyHUNAN ZHUZHOU SHIFENG REFINED INDIUM WORKS