Sn40/Pb60 Leaded Solder Wire

Manufactured from 100% refined virgin tin-lead alloys, Sn40/Pb60 leaded solder wire features a wide melting range of 183°C–238°C. Compared to eutectic tin-lead alloys (Sn63/Pb37), this alloy provides an extended pasty (semi-plastic) range during cooling, giving operators valuable time for component positioning and manual adjustment. This makes it the premier choice for manual PCB soldering, cable harness assembly, transformer winding, and electrical maintenance, effectively minimizing cold joints, bridging, and rework rates.

High-Purity Virgin Metals & Trace Impurity Control
Produced exclusively from refined virgin tin and lead ingots, strictly avoiding recycled scrap materials to guarantee metallurgical stability.
Every raw material and finished batch undergoes rigorous ICP-AES spectrometer analysis to tightly control trace impurities (such as Cu, Fe, and Cd), ensuring stable wetting behavior and minimal dross generation during high-temperature heating.

Wide Pasty Range for Manual & Rework Operations

• The solid-liquid coexistence range (~55degC transition span) offers an optimal semi-plastic cooling buffer.
• Especially suited for complex cable harnesses, transformer pins, discrete component rework, and heavy-duty electrical maintenance, allowing operators to adjust, align, or secure components before the solder fully solidifies.

Uniform Flux Distribution & Precision CNC Winding

• Processed with advanced automated core-filling equipment to guarantee a continuous, even distribution of rosin flux inside the wire without voids, ensuring rapid wetting and low smoke emission.
• Utilizes precision CNC layer-winding technology to ensure smooth, tangle-free feeding during continuous or high-speed manual/semi-automated operations without overlapping or jamming.

To ensure consistent, zero-defect performance for high-volume industrial applications, every production lot undergoes strict multi-stage factory testing:

As an experienced direct manufacturer, we provide flexible, tailor-made solutions for global industrial buyers, wholesalers, and brand distributors:

Customization Options: Wire diameters (0.3 mm - 3.0 mm), flux percentages (1% - 3%), and specific chemical activity requirements (RA/RMA/No-Clean, halide-free options available).

Branding & Packaging Support: Customized spool dimensions, private-label spool stickers, custom color boxes, and neutral export master cartons designed for safe international shipping.