... Molecular Weight : 81.38 Zinc Oxide 99.7% specsWe can prvoide the zinc oxide with direct and undirect method .WE ... ≤0.00080.0006CuO(Cu) % ≤0.0100.010Sieve Residue(45um)4-2015 Direct Zinc Oxide 99.5% ~90%, etc. - Indirect ZnO: 99.9 ... %,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 ...