... CuO%,98%;Cu,78.2% 2)Package,25kg/bag 3)Usage,circuit board plating, Ferrite magnetic materials copper ... density 6.315, melting point 1446 °C, Mohs hardness 3-4, dielectric constant 18.10, insoluble in water, soluble ... , which leads to hydrogen or carbon monoxide at high temperature can be reduced to metallic copper. Mainly ... 0.010.20.2Cl¯ ≤%0.010.20.2 High quality black copper oxide plating grade