Cupric oxide wire (CuO) is a specialized form primarily used in elemental analyzers, such as CHNS/O analyzers, where it functions as an oxidation catalyst packed in combustion tubes. It facilitates the complete combustion of organic samples, enabling precise determination of carbon, hydrogen, nitrogen, and sulfur content in materials like polymers, pharmaceuticals, and environmental samples. This wire form (typically 0.5 mm diameter) ensures efficient gas flow and high reactivity. Beyond analytical applications, cupric oxide is employed in the electronics industry as a component in semiconductors and photovoltaic cells to enhance efficiency and conductivity. In ceramics, it serves as a pigment for blue or green coloration in glazes and glass. It also acts as a catalyst in various industrial oxidation reactions and is used in environmental technology for sulfur removal from gases to reduce emissions in power plants.