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A. The residue in dissolved flux that has not been
washed off the board. Cleaning flux off a circuit board
is more involved than simply spraying a cleaner onto it.
I?P?RTANT?
Removing flux is a two-step process. The first step is dissolving the flux. The
second step is rinsing off the dissolved flux. The rinsing step is very important
because after dissolving the flux it may appear that the solids in the flux have
disappeared, but once the flux remover has evaporated away, the solids will
re-deposit on the board as white residue.
Step 1: Dissolving the Flux
If you are using flux remover in aerosol form, spray a little flux remover onto the
flux, then agitate with a hog hair cleaning brush. If you are using our 4140 Flux
Remover, you may spray it liberally, as it is safe on your components. If you are
using 413B Heavy Duty Flux remover, you may spray it liberally on the solder side
of the board, but be careful to only apply it directly to the flux contaminated area
if you are using it on the component side of the board, as it will harm some
components. The 4140 is plastic safe so it may be applied liberally. Have a can of
413B handy in case you run into a patch of burnt-on difficult to remove flux.
If you are using flux remover in liquid form, pour the flux remover into a tray. If you
are using 4140 Flux Remover, you may then submerge the PC board into the tray,
agitating the flux with a hog-hair brush. If you are using 413B Heavy Duty Flux
Remover, you should not submerge the board into the tray, as the components will
be damaged. Instead, wet the hog-hair brush you are using by dipping it into the
tray, and then use it to agitate the flux on the board. Periodically rinse and re-wet
the brush by swishing it in the flux remover.
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