... 7H2O is used in making , in coagulation baths for , in for zinc plating, as a in dyeing, as a ... 250 µm Sieve):>98%OTHER COMPONENTS AND PROPERTIES:(for reference only)Co:50ppm max<20ppmNi:50ppm max<20ppmMo ... , avoid rain, moisture, or mixed with acid / alkali matter and color matter; packed in dry and airiness ... place, no contact with acid and alkali and color matter. for animal feed grade zinc sulfate