Overview
Lead-containing solder wire is a fusible alloy primarily composed of tin (Sn) and lead (Pb), with common ratios including 60/40 (Sn/Pb) and 63/37. Developed in the mid-20th century, it became the standard for electrical connections due to its reliable performance and ease of use. Despite increasing restrictions under RoHS directives, it remains permitted for certain critical applications like aerospace, military, and some automotive systems where alternatives may compromise reliability. The alloy's eutectic properties (63/37 ratio melts at 183°C) make it particularly valuable for precision work.
Physical and Chemical Properties
The alloy exhibits a shiny metallic luster when fresh but oxidizes to a dull gray over time. Its thermal conductivity ranges between 30-50 W/mK, while electrical conductivity is approximately 11% that of pure copper. Mechanically, 60/40 solder offers tensile strength of about 56 MPa and elongates 30-40% before fracture. The addition of lead lowers the melting point compared to pure tin (232°C), with eutectic 63/37 alloy melting completely at 183°C – a sharp phase transition valuable for controlled soldering.
Main Applications
In electronics manufacturing, leaded solder is used for through-hole components, wave soldering, and rework stations where its self-centering properties are advantageous. High-reliability sectors like medical imaging equipment and satellite systems often still require it. Plumbing applications include joining copper pipes, though this has largely transitioned to lead-free alternatives. Automotive applications focus on under-hood electronics and legacy system repairs where thermal cycling resistance is critical.
Safety and Storage
Lead exposure risks require OSHA-compliant handling: use local exhaust ventilation (LEV), wash hands after use, and prohibit eating in work areas. Proper storage involves sealed containers with desiccant to prevent oxidation. Waste management must comply with hazardous material regulations – solder dross and contaminated materials require special disposal. Many facilities implement lead monitoring programs including regular blood testing for exposed workers.
B2B Procurement Guide
Industrial buyers should verify supplier certifications like ISO 9001 and request mill test reports for alloy composition. Diameter selection depends on application – 0.5mm for fine pitch SMD work, 1.0-1.2mm for general PCB assembly. For large-volume purchases, consider flux-cored options (typically 2-3% rosin core) to streamline production. Spot-check incoming shipments for oxidation and diameter consistency. Some manufacturers offer custom alloys with trace silver (1-2%) for improved thermal fatigue resistance.
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