Selective soldering flux is a specially formulated flux designed for localized application in selective soldering processes. It is used to prepare and protect through-hole component leads and pads prior to targeted soldering, without affecting surrounding SMT components.

Unlike wave soldering, which immerses the entire underside of a PCB in molten solder, selective soldering targets individual through-hole areas using precise nozzles. This minimizes thermal stress on sensitive components and allows mixed-technology assemblies to be soldered after SMT reflow.

A good selective soldering flux must offer excellent thermal stability, low residue, strong wetting on oxidized metals, and minimal spattering. INVENTEC Performance Chemicals develops fluxes that meet these requirements while remaining stable during preheat and soldering.

The main types include no-clean and water-soluble fluxes. No-clean fluxes are widely used due to their minimal residue, while water-soluble options are preferred when absolute cleanliness is required. INVENTEC provides both types for various process needs.

Flux is precisely applied to targeted areas using micro-spray or drop-jet systems. Proper application ensures activation of solder surfaces while avoiding excess flux that can cause bridging or require post-cleaning.

Yes. Selective soldering fluxes are formulated to be compatible with lead-free alloys such as SAC305 and SnCu0.7. INVENTEC’s fluxes are RoHS-compliant and optimized for lead-free performance in demanding industrial applications.

Poor flux performance can result in non-wetting, bridging, icicling, or insufficient hole fill. Choosing a high-quality selective soldering flux and optimizing application parameters is key to achieving consistent, defect-free joints.

Industries such as automotive electronics, industrial controls, aerospace, medical devices, and telecommunications rely on selective soldering for high-reliability through-hole components. Proper flux selection ensures robust solder joints in these critical applications.

Yes. INVENTEC offers both no-clean fluxes with minimal residue and water-soluble fluxes that can be fully removed using aqueous cleaning systems. Selection depends on your post-soldering requirements and board sensitivity.