... 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 ... or as required by the customerDirect process zinc oxide quality meet standard of GB/T3494-1996 Item/ParameterStandardZinc ... ZnO 95%ZnO 90%Lead oxide (PbO)% ≤0.120.21.03.04.0Cadmium oxide (CdO) % ≤0.020.05------Cupric oxide (CuO) % ≤0 ...