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Flux for Wave Soldering Processes

Electronic flux plays a critical role in today’s soldering processes, ensuring the formation of clean, reliable, and durable solder joints. Its primary function is to remove oxides from metal surfaces, protect them from reoxidation during heating, and promote proper wetting between solder and substrate. Without flux, soldering efficiency, joint strength, and long-term reliability would be significantly compromised, especially in high-density and lead-free manufacturing environments.

Electronic flux can be categorized into several types based on composition and performance requirements. Lead-free flux is specifically designed to support modern environmental standards and complies with global regulations such as RoHS. These fluxes are formulated to perform effectively at higher soldering temperatures, offering stable activity, reduced spattering, and strong joint formation when used with lead-free alloys.

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    Halogen-free flux is another important category aimed at reducing corrosive residues and improving long-term reliability. By eliminating halogens such as chlorine and bromine, these fluxes help prevent electrical leakage, corrosion, and material degradation, making them suitable for sensitive and high-reliability electronics including consumer devices, automotive electronics, and telecom equipment.
    Low-solids flux often associated with no-clean formulations contains minimal residue after soldering. This reduces or eliminates the need for post-solder cleaning, lowering production costs and avoiding issues related to residue buildup on fine-pitch components. Despite having reduced solid content, these fluxes maintain effective activation to ensure proper wetting and minimal soldering defects.
    Lastly, high-compatibility flux is engineered to work across a wide range of solder alloys, PCB finishes, and manufacturing processes. These fluxes provide consistent performance in reflow, wave, and selective soldering, making them ideal for manufacturers seeking flexibility and process stability.
    With optimized chemistry and performance, electronic flux continues to be an essential material for achieving high-quality, reliable, and efficient electronic assembly.

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