Solder flux pen


Kester® 0.33 oz. Low-Solids No-Clean Flux Pen®

Designed for leaded and lead-free rework of conventional and surface mount circuit board assemblies.

Kester 951 is a halogen-free, non-rosin organic Flux Pen that is specifically designed for rework of conventional and surface mount circuit board assemblies. The extremely low solids content (2.0%) and nature of the activator system results in practically NO RESIDUE left on the assembly after soldering. There are no residues to interfere with electrical testing. Kester 951 exhibits improved soldering performance to minimize solder bridges (shorts) during rework operations.

This flux is suitable for automotive, computer, telecommunications and other applications where reliability considerations are critical. The surface insulation resistance on soldered boards is higher than that provided by typical organic water-soluble fluxes. Kester 951 contains a corrosion inhibitor such that no corrosion products are formed when bare copper surfaces are exposed to humid environments.


  • Used for soldering critical assemblies in the telecommunications, computer and other industries
  • Will not create excessive foaming in standard water cleaning systems
  • High activity
  • Chemically compatible with most solder masks and board laminates
  • pH Neutral Chemistry
  • Classified as ORH1 per J-STD-004


  • 77-FLX

1.14 oz


In Stock