Overview
Tinned copper wire consists of high-purity copper strands electroplated with a thin layer of tin, combining copper's excellent conductivity (100% IACS) with tin's corrosion resistance. The tin coating typically constitutes 2-5% of total weight. This dual-material construction makes it ideal for applications requiring long-term reliability in humid or chemically aggressive environments. Manufactured through continuous electroplating processes, export-grade tinned copper wire adheres to international standards like ASTM B33, IEC 60228, and JIS H3260. Common gauges range from 0.05mm to 6mm, with temper options including soft, half-hard, and hard drawn to suit different mechanical requirements.
Physical and Chemical Properties
The copper core provides a conductivity of 58.5×10⁶ S/m at 20°C, while the tin coating (99.9% purity) offers a contact resistance below 0.5Ω. The tin layer thickness usually measures 1-5μm, sufficient to prevent copper oxidation without significantly increasing resistance. Chemically, the tin coating reacts minimally with atmospheric oxygen, forming a passive SnO₂ layer that protects the underlying copper from sulfurization and oxidation. This extends service life by 3-5 times compared to bare copper in marine or industrial environments. The wire maintains flexibility down to -40°C, with tensile strength ranging from 200-400 N/mm² depending on temper.
Main Applications
In electronics manufacturing, tinned copper wire serves as jumper wires in PCBs and lead wires for components, where its solderability (wetting time <2s at 250°C) speeds up assembly. Power systems utilize it for transformer windings and motor coils, especially in tropical climates where humidity accelerates bare copper degradation. The telecommunications industry employs it in coaxial cable shielding and submarine cable conductors. Automotive applications include sensor wiring harnesses and battery interconnects, where vibration resistance is critical. Recent growth in renewable energy systems has increased demand for tinned copper in solar panel junction boxes and wind turbine generator coils.
Safety and Storage
Though non-flammable, tinned copper wire should be stored away from strong acids or ammonia compounds that could damage the tin coating. Ideal storage conditions maintain relative humidity below 65% at 15-30°C. Spooled wire requires periodic rotation to prevent deformation from prolonged pressure points. When processing, ensure proper ventilation during soldering to avoid tin fume inhalation. The wire's lead-free composition meets RoHS Directive 2011/65/EU requirements, but verification of material certifications (typically provided as Mill Test Reports) remains essential for export compliance.
B2B Procurement Guide
Industrial buyers should specify: 1) Conductor class (Class 1-6 per IEC 60228), 2) Tin coating thickness (minimum 2μm for harsh environments), 3) Packaging (wooden spools for heavy gauges, plastic bobbins for fine wires). MOQs typically start at 500kg, with bulk discounts available for 5+ ton orders. Key quality checks include measuring resistance (should not exceed 0.017241 Ω·mm²/m at 20°C), inspecting coating continuity via salt spray testing (96hrs minimum per ASTM B117), and verifying dimensional tolerances (±0.01mm for diameters under 1mm). Reputable manufacturers provide third-party SGS reports covering composition analysis and mechanical properties.
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