... only zinc oxide with coloring and hiding power, but also are coatings of preservatives and brightening agent. In medicine and public health and food industry, zinc oxide ... outer polypropylene woven bag, 25kg, 50kg, big sack bag Zinc Oxide Grades : Indirect process Zinc Oxide, Direct Process Zinc Oxide, Calcined Zinc Oxide, Feed Grade Zinc Oxide, Pharmaceutic Zinc Oxide, nanometer Zinc Oxide, etc.