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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.
I½P½RTANT½
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.
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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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MG Chemicals
AppGuide
Step 2: Rinsing the Board
You must ensure that you rinse off the dissolved solids completely before the flux
remover evaporates and the solids re-deposit. If you are using flux remover in
aerosol form, the easiest way to do this is to hold the board vertically and liberally
apply more flux remover until you see the flux remover running off of the board. If
you have dissolved the flux by submerging the board in liquid flux remover, just dip
the board into the tray and swish the flux remover and you should be ok.
One company. Many solutions.
Aerosol cleaning method with
4140-400G Plastic Safe Flux
Remover or 413B-425G Heavy
Duty Flux Remover
If you have been using the particular tray to dissolve flux on a number of boards,
dissolved flux may accumulate in the tray and dipping the board may actually
deposit flux solids onto the board. In this case you will want to either set up a
separate tray for rinsing, or have an aerosol can handy for rinsing. A particularly
good option for rinsing dissolved flux off of a board is to use our 406B Super
Wash. Super Wash comes in a large aerosol can, allowing for liberal use, and it
dries very rapidly. Super Wash will rinse off un-evaporated flux remover as well as
flux solids, and almost immediately after rinsing your board, it will be dry and
ready for service.
When rinsing many boards,
dissolved flux may accumulate
in the tray and dipping the
board may actually deposit flux
solids onto the board.
Tray method with liquid flux remover
Products Discussed
Stock Code
4140-400G
4140-500ML
4140-1L
Product Name
Plastic Safe Flux Remover
Plastic Safe Flux Remover
Plastic Safe Flux Remover
Size
14 oz (400 grams)
17 oz (500 ml)
33 oz (1 liter)
15 oz (425 grams)
33 oz (1 liter)
16 oz (450 grams)
7¾“ in length
Form
Aerosol
Liquid
Liquid
Aerosol
Liquid
Aerosol
Brush
413B-425G Heavy Duty Flux Remover
413B-1L
Heavy Dusty Flux Remover
406B-450G Super Wash Cleaner / Degreaser
Hog Hair Cleaning Brush
852
Larger sizes available for liquid forms.
E-mail
Phone
Fax
salesusa@mgchemicals.com
1-800-201-8822
1-604-888-3084
1-800-708-9888
1-604-888-7754
For technical specifications,
MSDS, tech support and more
To customize this AppGuide
for your own use please email
www.mgchemicals.com info@mgchemicals.com
ISO 9001:2000
Registered Quality System. QMI Certificate #004008 Toronto, Canada.
