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Various forms of solder are available on the market, each suited to specific soldering techniques and tools. The most common is rosin-cored solder wire, which is suitable for hand soldering using an iron. More advanced processes utilize solder pastes, essential for surface mount technology (SMD), where application is automated using screen printing. The alloy composition is also an important criterion. These typically include lead-free solders compliant with the RoHS directive, used in modern electronics; lead-based solders, valued in repair shops for their ease of work and lower melting point; and special alloys with added silver or copper, which improve conductivity and mechanical strength. It is within the "other solders" group that you can find less standard products, rarely used, but crucial in specific applications.
Modern electronics production requires rigorous standards, particularly regarding compliance with the RoHS directive, which limits the use of lead and other harmful substances. This is why repair shops often choose lead-free alloys, which, despite their slightly higher melting point, offer equally good mechanical and electrical properties. Tin purity is also important, as the absence of impurities helps prevent connection defects and conductivity issues. In practice, this translates into greater reliability and safety of finished devices.
"Other" types of solder play a vital role wherever standard solders prove insufficient. Sometimes specific wire diameters are required, tailored to microscopic solder pads, while other times alloys resistant to high operating temperatures or high-humidity environments are required. This category offers solutions for advanced designers, professional repair shops, and enthusiasts seeking specific properties. These solutions enable the implementation of projects that defy standard applications while maintaining the highest quality and repeatability of connections.