speciallized manufacturer and exporter of zinc oxide, direct method,95%,98%,99%, indirect method 99.7%, ... 99.8% speciallized manufacturer and exporter of zinc oxide , direct method,95%,98%,99%, indirect method 99.7 ... ,99.8% for rubber,PHARMItemStandard(GB/T3494-1996 (%)Zinc oxide%99.0min.Lead oxide(Pbo)%0.20max.Cadmium oxide ...