Analyzing the main components of solder bars, when recycling tin dross solder bars, one must consider the primary components inside the solder bars. The components of solder bars are divided into two major parts: flux and solder powder. The main components of the flux are activators, thixotropic agents, resins, and solvents. Solder powder, also known as tin powder, is primarily composed of tin-lead alloys, with a common ratio of 63/37.
Solder paste is used for fluxing, serving to isolate air to prevent oxidation, adding capillary action, enhancing wetting properties, and preventing dry solder joints. Solder paste appears as white crystalline powder, with a content of 99.0%, an acid value of 0.5mgKOH/g, melting point at 112°C, and is easily soluble in ethanol and isopropanol. It is widely used in organic synthesis and pharmaceutical intermediates, acting as a surfactant in fluxes and the production of recycled tin pastes. It has high anti-resistance and strong activity, with certain effects on brightness and full soldering. This is the best surface-active additive among all fluxes, widely used in high-precision electronic components as mid-to-high-end environmentally friendly fluxes.
In lead-free solder bars, the main components are composed of tin/silver/copper, where silver and copper replace the original lead content.
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