• High activity
• Minimizes icicling and bridging
• Chemically compatible with most solder masks and board laminates
• High ionic cleanliness
• No surface insulation resistance degradation
• Excellent choice for surface mount boards
• Classified as ORH0 per J-STD-004
• Completely biodegradable for environmentally safe disposal of the wash water
• No offensive odors or excessive smoke emitted during soldering
• Will not create excessive foaming in standard water cleaning systems
• Provides better surface insulation resistance than typical water soluble fluxes, making it particularly suitable for surface mount assemblies

Kester 2120 Soldering Flux is a halide-free, 14% solids organic flux designed for automated soldering of circuit board assemblies. This flux provides good activity on both bare copper and solder coated boards. The absence of chlorides, bromides, phosphates and highly corrosive materials facilitates removal after soldering. 2120 produces bright, shiny solder joints and high ionic cleanliness after water cleaning.