Heavy metal free, free flowing, the best quality, you've never experienced, BASIC INFORMATION: CAS No.: 7446 ... NO.: 231-793-3 Formula: ZnSO4•7H2O Other name: zinc sulfate,zinc sulphate,zinc sulphate hepta,zinc sulfate hepta,white vitriol,salt of vitriolSPECIFICATION: Zn: 21.5% ... trace element, prevent and cure some diseases because of zinc deficiency and prevent premature death. It also can increase ...