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Wednesday, April 20, 2011

Removing RMA Solder Flux

Question: 
We need to remove RMA solder flux on indium/lead soldered subassemblies. Most aqueous cleaners attack this solder.


Answer:
According to the Materials Handbook by GS Brady et al, indium lead solders are alkali resistant solders.  Rosin based RMA fluxes are best cleaned by alkaline/saponifying cleaners with no conductive cations such as Detergent 8.  


The organic amine in Detergent 8 forms a water soluble soap with the rosin. Because Detergent 8 is cation free, it cannot leave conductive residues.  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 subassemblies.  


Detergent 8 is a hazmat that most package sizes must ship by ground.  You can ship a 5 gallon jerrycan of Detergent 8 by air.

1 comment:

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