Bare copper wire is a pure copper conductor refined from high-purity electrolytic copper through drawing, annealing and other processes, without any coating or insulation layer. It features excellent electrical and thermal conductivity, mechanical workability and chemical stability, serving as a fundamental core material for wires and cables, electronic appliances, motors and transformers, wiring harness connectors, and power transmission applications. Classified by hardness into soft, half-hard and hard types, bare copper wire comes in a full range of diameter specifications with high dimensional accuracy. It has a smooth surface free from oxidation and burrs, stable conductivity, low contact resistance and low signal transmission loss. Mechanical properties such as tensile strength and elongation can be customized according to application scenarios. Widely used in electronic manufacturing, automotive wiring harnesses, communication equipment, photovoltaic modules and various electrical devices, it complies with many domestic and international standards including GB, IEC, ASTM and JIS, combining practicality and cost-effectiveness.