Overview
Rectangular solid copper bars are precision-engineered metal profiles with uniform cross-sections, primarily made from pure copper (C10100/C10200) or phosphorus-deoxidized copper (C11000). They are favored in industries requiring reliable electrical or thermal conductivity combined with mechanical strength. Standard sizes range from small bars (e.g., 5mm × 10mm) to large sections (up to 200mm × 300mm), with lengths typically cut to order. Their rectangular shape provides efficient surface area for connections in busbar systems and simplifies mounting in structural applications.
Structure and Working Principle
These bars are manufactured through continuous casting or extrusion processes, ensuring a dense, void-free microstructure. The rectangular geometry offers flat surfaces for secure bolted joints in electrical systems, minimizing contact resistance. In electrical applications, copper’s low resistivity (1.68×10⁻⁸ Ω·m at 20°C) enables efficient current transfer. For thermal uses, its high thermal conductivity (401 W/m·K) facilitates heat dissipation in heat sinks and exchangers.
Key Features
Electrical Conductivity: 100% IACS (International Annealed Copper Standard) for pure grades, making them ideal for power distribution. Corrosion Resistance: Natural oxide layer protects against moisture and chemicals, though tarnishing may occur in sulfur-rich environments. Machinability: Softer tempers (like H00) allow easy cutting/drilling, while cold-worked tempers (H04) provide higher rigidity for structural loads.
Application Areas
Electrical Engineering: Busbars, switchgear components, and grounding systems in substations. Industrial Machinery: Heat exchanger cores, electrode holders, and wear plates. Construction: Decorative cladding, lightning protection systems, and architectural accents. Renewable Energy: Wind turbine grounding and solar panel mounting structures.
Maintenance and Precautions
Storage: Keep in dry, ventilated areas to prevent oxidation. Polyethylene wrapping is recommended for long-term storage. Handling: Use gloves to avoid fingerprints that may accelerate tarnishing. For electrical applications, clean contact surfaces with copper-specific cleaners before installation. Compatibility: Isolate from aluminum or steel with dielectric barriers to prevent galvanic corrosion in humid environments.
B2B Procurement Guide
Specifications: Define alloy (e.g., C10100 for high conductivity), temper (annealed vs. hard-drawn), and tolerances (ASTM B187 is common). Certifications: Require mill test reports (MTRs) for composition and conductivity verification. RoHS/REACH compliance may be needed for EU markets. Suppliers: Source from ISO-certified manufacturers with in-house testing labs. Bulk orders (1+ metric tons) often qualify for discounts. Customization: Some suppliers offer pre-cut lengths, drilled holes, or silver-plated finishes for specialized applications.
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