Qualitek Delta 399-42 is a homogeneous mixture of halogen-free, low solids organic flux designed for high-temperature lead free wave-soldering, selective soldering, surface mount assembly and through-hole applications. 399-42 exhibits excellent wetting and through-hole fill. 399-42 was formulated specifically for lead-free soldering processes.
399-42 flux is ideal for conventional PTH components and SMT PCB assemblies, producing bright solder joints and with no need to post clean.
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