Fine diameter 0.004" (0.10mm) flux-cored wire is made with Pb-free alloys to help meet requirements of fine-pitch applications.

Designed to provide fine wire for increased solder joint density and miniaturization in applications where solder paste reflow and other soldering approaches are not effective, such as robotic soldering for fine-pitch attachment of small components to medical devices or fine-pitch PCB assemblies. Hand soldering and rework may be possible. Fluxes recommended are Core 230-RC and CW-807. Fine diameter wire is available in SAC 305; SAC 387; Sn96.5Ag3.5; Sn96.3Ag3.7; and Sn96Ag4.

Indium
indium.com/flux-cored-wire