Oxygen-free copper is generally considered to be pure copper that does not contain oxygen or any deoxidizers or residues; however, it actually still contains a very small amount of oxygen and some impurities, just a very small amount! According to the standard, its oxygen content is not greater than 0.003%, the total content of impurities is not greater than 0.05%, the purity of copper is greater than 99.95%. Therefore, oxygen-free copper has higher electrical and thermal conductivity, as well as better corrosion resistance and processing performance due to its very low oxygen content. Oxygen-free copper is mainly used for electric vacuum instrumentation parts, such as busbar, conductive strip, waveguide, coaxial cable, vacuum seals, vacuum tubes, transistors of the components. Oxygen-free copper has excellent processing performance and is suitable for fine processing. Oxygen-free copper can be regarded as a special type of purple copper.
