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No-clean Rosin-based Flux 305

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No-clean Rosin-based Flux 305

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Qualitek® 305 is a no-clean, rosin-based, halogen-free flux designed for leaded soldering. It provides excellent wettability on PTH boards and leaves minimal, non-conductive residues for reliable electronic assembly.

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Description

Qualitek® 305 is a no-clean, rosin-based, halogen-free flux designed to deliver superior soldering performance, particularly on single- and double-sided plated through-hole (PTH) boards. Comparable to RMA-type fluxes, it provides excellent wettability while leaving minimal to no visible residue after soldering. Originally formulated for tin-lead soldering processes, it ensures reliable performance with non-conductive residues, making it suitable for high-reliability electronic applications.

Applications

Hand soldering and general electronic assembly using rosin-based flux-cored solder wire
Soldering on single- and double-sided PTH boards
Applications requiring enhanced wetting and solder spread compared to standard rosin (RMA) fluxes
Soldering of oxidized or difficult-to-solder metals requiring higher flux activity
Electronics manufacturing, SMT & PCBA assembly, and rework processes
Applications where flux residue removal is optional depending on process requirements
High-reliability electronic assembly requiring controlled rosin activation and stable performance

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