In wire and cable manufacturing, conductor materials mainly include silver, copper, and aluminum. Silver offers the highest electrical conductivity, but due to its high cost, it is typically used in high-frequency signal cables, precision instrument cables, and high-end audio cables. Copper has conductivity second only to silver and offers excellent processability, mechanical properties, and corrosion resistance, making it widely used in power cables, building wiring, control cables, and communication cables. Aluminum has a conductivity of approximately 60% of copper (about 61% IACS) while having only one-third of copper’s density and a lower cost, making it commonly used in aerial insulated cables, transmission lines, and large cross-section power cables.
The performance of a conductor depends not only on the metal itself but also on the compatibility of insulation compounds, sheathing compounds, and related material systems. Taking high-purity oxygen-free copper as an example, insufficient material compatibility may lead to interface stability issues during long-term service, potentially affecting electrical performance and reliability. Polyvinyl Chloride (PVC), Cross-Linked Polyethylene (XLPE), and Polypropylene (PP) insulation compounds each have different characteristics in terms of heat resistance, electrical performance, and chemical stability. Among them, XLPE and PP are generally better suited for applications requiring higher temperature ratings or enhanced electrical performance. Therefore, conductor–insulation compatibility is an important consideration in cable design.
During the wire drawing process, copper conductors develop internal stress, which can affect electrical conductivity. Through annealing, conductivity can be improved while enhancing flexibility. However, annealed soft copper conductors have relatively lower mechanical strength. As a result, conductor tension, extrusion temperature, and cooling conditions must be properly controlled during insulation extrusion to ensure conductor stability and insulation layer uniformity. This highlights the importance of coordination between conductor processing and insulation extrusion processes.
In high-frequency signal transmission, the skin effect causes electrical current to concentrate on the conductor surface, making surface conductivity characteristics particularly important. In some cost-sensitive applications, Copper-Clad Aluminum (CCA) conductors are used to balance cost and weight, while Silver-Coated Copper (SCC) or silver-plated copper conductors are more commonly used in high-performance and high-reliability applications. Meanwhile, insulation materials with low dielectric constant and low dielectric loss—such as Foam Polyethylene (Foam PE), Foam Polypropylene (Foam PP), and high-purity XLPE compounds—can help reduce signal attenuation and improve high-frequency transmission performance.
Different applications require different conductor materials. Railway signaling cables generally prioritize copper conductors to ensure mechanical reliability and signal stability. Aerial transmission lines widely use aluminum conductors, typically combined with weather-resistant PVC or black Polyethylene (PE) sheathing for enhanced environmental durability. Marine and offshore cables often prioritize Low Smoke Zero Halogen (LSZH) sheathing compounds to meet low-smoke, halogen-free, and low-toxicity fire safety requirements. In new energy vehicle (NEV) high-voltage wiring harnesses, aluminum conductors require compatible XLPE insulation compounds, heat-resistant sheathing compounds, and specialized terminal connection solutions to ensure long-term connection reliability.
In summary, conductor selection involves not only conductivity, mechanical strength, weight, and cost, but also the coordinated design of insulation compounds, sheathing compounds, and related cable materials. Materials such as XLPE insulation compounds, PVC sheathing compounds, LSZH compounds, Foam PE, and Thermoplastic Elastomers (TPE) directly influence the electrical performance, heat resistance, and service life of conductors. Proper matching between conductors and cable materials is essential to achieving both cable reliability and cost-effectiveness.
Post time: May-29-2026