Tin-Plated Copper Stranded Wire

Product Features

Outstanding Corrosion Resistance: The tin-plated surface effectively isolates copper from air and moisture, preventing oxidation into patina (basic copper carbonate). It resists sulfidation and salt spray corrosion, significantly extending service life in harsh environments such as humidity, acids, and alkalis.

Excellent Solderability: The tin layer enables simple, fast, and reliable soldering, with smooth solder joints that eliminate the need for highly corrosive fluxes. This improves production efficiency and connection reliability.

High Conductivity & Low Impedance: The copper core offers excellent conductivity, while the tin plating provides superior high-frequency conductivity compared to bare copper. It also minimizes contact resistance increases caused by surface oxidation, ensuring stable current transmission.

Exceptional Flexibility & Fatigue Resistance: The multi-strand fine copper wire construction withstands high-frequency vibration, bending, and thermal expansion/contraction without breaking, making it ideal for dynamic connections and stress compensation applications.

Strong Oxidation Resistance & Aesthetic Appeal: The tin layer maintains a bright, silvery luster over time, offering both an attractive appearance and ease of further processing.

II. Application Fields

Tin-plated copper stranded wire is the preferred solution for high-performance flexible electrical connections across industries, thanks to its superior corrosion resistance, excellent conductivity and solderability, and outstanding flexibility and fatigue resistance.

New Energy: Widely used in electric vehicle power battery packs for cell series/parallel connections, flexible jumpers between modules, and high-voltage links, effectively addressing vibration and thermal management challenges. Also employed in energy storage systems for high-current interconnections.

Power Transmission & Distribution: Serves as a key flexible component in transformers, reactors, and high/low-voltage switchgear to absorb thermal and electromagnetic stress.

Other Critical Applications: Industrial equipment (e.g., welding machines, frequency converters), rail transit (grounding and pantograph connections), marine electrical systems, and communication devices. It provides reliable, long-lasting electrical connectivity in demanding environments.

III. Structural Composition

Material Composition:

Core Wire: High-quality red copper (T1/T2) wire ensures excellent conductivity and flexibility.

Plating Layer: A uniform layer of pure tin (Sn) or tin alloy applied via hot-dip or electroplating. Plating thickness is critical for corrosion resistance and solderability.

Physical Structure:

Single Wire: Multiple ultra-fine tin-plated copper round wires. Single-wire diameter (e.g., 0.10mm, 0.15mm) determines overall flexibility.

Stranding: Multiple tin-plated copper wires (from dozens to hundreds) are spirally stranded in concentric layers, a core process that delivers high flexibility.

Bundling/Assembly: Stranded wires can be used directly as flexible conductors or further braided into flat braided straps to increase cross-sectional area and heat dissipation.

Terminals: Customizable with pressed-on terminals (e.g., copper tube terminals, lugs, solder tabs), often plated with tin or silver for easy installation.