Overview
Pure copper flexible core is a malleable, high-purity copper wire annealed to enhance flexibility without compromising conductivity. It is a staple material in electrical engineering due to its unmatched ability to transmit electricity and heat efficiently. The annealing process reduces brittleness, making it ideal for applications requiring repeated bending or shaping. Copper’s natural corrosion resistance and durability further extend its lifespan in harsh environments. Industries favor it for its reliability in critical systems like power distribution and telecommunications. Its reddish-brown hue and soft texture distinguish it from rigid or alloyed copper variants.
Physical and Chemical Properties
The core’s flexibility stems from its annealed state, which realigns copper’s crystalline structure to eliminate internal stresses. This results in a tensile strength of 200–250 MPa and elongation rates up to 30%, allowing it to withstand mechanical stress. Its electrical conductivity (100% IACS) and thermal conductivity (401 W/m·K) are benchmarks for performance. Chemically, pure copper resists oxidation in dry air but may form a patina (verdigris) in humid conditions. It is inert to most solvents but reacts with acids and ammonia. The CAS number 7440-50-8 identifies its elemental form, with minimal impurities (≤0.1%).
Main Applications
Primary uses include stranded electrical cables, where flexibility prevents breakage during installation. It is also integral to motor windings, transformers, and busbars, ensuring minimal energy loss. In construction, it serves as grounding wire due to its low impedance and earth compatibility. Telecommunications rely on its signal integrity for coaxial cables and networking hardware. Specialty applications include jewelry crafting and medical equipment, leveraging its non-reactive and hypoallergenic properties. Automotive industries use it in wiring harnesses for its vibration resistance.
Safety and Storage
Store in moisture-proof packaging to prevent oxidation, which can degrade conductivity. Although non-toxic, prolonged skin contact may tarnish the surface; nitrile gloves are recommended during handling. Avoid exposure to sulfur compounds (e.g., rubber) to prevent black sulfide formation. For fire safety, copper’s high melting point (1085°C) makes it resistant to ignition, but insulated cores may emit fumes if overheated. Dispose of scraps via metal recycling programs to align with environmental regulations.
B2B Procurement Guide
Prioritize suppliers providing mill test reports (MTRs) confirming ≥99.9% purity and compliance with ASTM B1/B3 or IEC 60228 standards. Bulk buyers should negotiate volume discounts, as prices fluctuate with copper market rates (LME benchmark). Inspect for consistent diameter (tolerance ±0.01mm) and surface smoothness, as imperfections can affect performance. For offshore procurement, verify RoHS/REACH certifications to ensure regulatory compliance. Lead times typically range from 2–6 weeks, depending on customization.
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