421A is a clear yellow immersion tin solution designed to coat copper traces and solder deposits with a thick coating layer of tin. The deposited tin is readily solderable and it extends the work life of circuits by protecting it from corrosion. The pure tin deposit provides excellent corrosion resistance, which is free of co‑deposited organics. 421A ensures good solderability for solder deposits by cleaning them and by making their surface bright and active.


Features and Benefits
  • No dilution required
  • High tin concentration
  • Rinsable residues
  • Good adhesion


Catalog Number Sizes Available Description
421A-125ML 125 mL (4.2 oz) Bottle
421A-500ML 475 mL (16 oz) Bottle

Safety Data Sheet
Technical Data Sheet