A 8342 RA Rosin Flux Paste superior electronic grade flux paste system that makes SMD electrical and electronics soldering faster and easier. It is designed for lead-free alloys, but it works well with conventional leaded solder. It is easy to apply and stays on the area where it is applied, and a little bit goes a long way. It does not contain any Zinc Chloride or Ammonium Chloride. Post soldering residues removal is much easier due to the organic acid base of the flux.