... .: 1317-38-0 3. various type our high-purity copper oxide powder is mainly uesed in exothermic welding.Main Features Specifications ... , Cl < 100ppm, Cl < 30ppm, Cl < 10ppm ), various type of cupric oxide-Less impurities ( Pb: max50ppm, Fe:max50ppm, Zn:max100ppm, Ni:max50ppm ... requested specifications and using amount, we will be able to supply sample and quotation.