Categorized | Detergent 8, Electronic

Removing RMA Solder Flux

Q: We need to remove RMA solder flux on indium/lead soldered sub assemblies. Most aqueous cleaners attack this solder.

A: Generally speaking, indium lead solders are alkali resistant solders.  Rosin based RMA solder flux is best cleaned by alkaline/saponifying cleaners with no chelating agents, halides or conductive metal cations such as sodium. Our Alconox, Inc. cleaner, Detergent 8® Low-Foaming Ion-Free Detergent is a great choice.

The ion-free formulation also ensures safety when cleaning circuit boards or other electronics that could be short circuited by even the most minute amounts of residual ions.  Because Detergent 8 is cation free, it cannot leave conductive residues.

The organic amine in Detergent 8 cleaner forms a water soluble soap with the rosin. We recommend using a 3% Detergent 8 solution for ultrasonic immersion cleaning or a 5% Detergent 8 solution for manual cleaning of indium/lead soldered sub assemblies.

To request any Alconox, Inc. detergents for free, please complete the questionnaire at Get Sample. For more information about any one of our Alconox, Inc. detergents, consult the technical bulletin for each product. Or click here to access each of our detergent’s Safety Data Sheets.

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