... powder,particles 3.ISO9001:20skype:angelchina3233% min Zinc Sulphate Fertilizer Granular-zinc sulphate mono -industry /feed /fertilizer grade -Zn: 21%, 22%, 33%, 35 ... Other name: zinc sulfate,zinc sulphate,zinc sulphate hepta,zinc sulfate hepta,white vitriol,salt of vitriolSPECIFICATION: Industry GradeAgriculture Grade Zn≥35.5 ...