Overview
Copper flat bars are semi-finished rectangular profiles made from pure copper (C10100–C11000) or alloys like brass/bronze. They are produced through hot/cold rolling processes, offering flexibility in thickness (3–50 mm) and width (10–300 mm). As a cornerstone material in electrical engineering, their high conductivity (100% IACS for pure copper) surpasses most metals. Historically, copper's use dates back to 8000 BCE, but modern flat bars gained prominence during the 19th-century electrification era. Today, they are standardized under ASTM B187 (busbars) and EN 13602 (general use), ensuring consistent quality for industrial buyers.
Physical and Chemical Properties
Pure copper flat bars exhibit 58 MS/m electrical conductivity and 401 W/(m·K) thermal conductivity, making them ideal for heat exchangers and power distribution. Their face-centered cubic structure enables exceptional formability—cold-worked bars achieve 40% elongation, while annealed variants reach 60%. Chemically, copper forms a protective patina (cuprous oxide) when exposed to air, resisting atmospheric corrosion. However, it reacts with sulfur compounds (tarnishing) and oxidizes above 180°C. Alloyed variants (e.g., C11000 with 0.04% oxygen) enhance strength without significantly compromising conductivity.
Main Applications
In electrical systems, flat bars serve as low-impedance busbars in switchgear, substations, and solar panel wiring due to their current-carrying capacity (e.g., 1000A for 10x50mm bar). They are also machined into terminals for transformers and circuit breakers. Architecturally, polished bars are used for decorative facades and anti-microbial surfaces in hospitals. Industrial applications include welding electrodes, heat sinks, and electromagnetic shielding. Emerging uses include battery interconnects for EVs and renewable energy systems.
Safety and Storage
While copper is non-flammable and non-toxic in solid form, dust from machining requires OSHA PEL compliance (1 mg/m³). Store bars away from ammonia, chlorides, and acidic vapors to prevent stress corrosion cracking. For long-term storage, coat bars with anti-tarnish solutions or vacuum-seal them. Hard temper bars (H04) are more brittle—handle with care to avoid edge cracks. Always ground copper components during installation to prevent static discharge in sensitive electronics.
B2B Procurement Guide
Key specifications include: 1) ASTM/EN standards (e.g., ASTM B187 for busbars), 2) temper (soft/O60 for bending, hard/H04 for structural use), and 3) surface finish (mill, polished, or tin-plated). Bulk buyers should verify material test reports (MTRs) for conductivity and traceability. Lead times vary: standard sizes (1–2 weeks), custom profiles (4–6 weeks). Consider CDA 110 (ETP copper) for general use or oxygen-free copper (C10100) for high-vacuum applications. Negotiate MOQs (typically 500 kg+) for better pricing.
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