Soft water is not DI water, [although DI water is soft.]
You can make hard water soft by
adding salts to it , for example washing soda -sodium carbonate. Naturally the
water is now full of ions, but not the ones which interfere with the
action of soaps /detergents.
Deionised water is what
it says, pure water, H2O and nothing else. Naturally it is soft as it has
nothing in it to interfere with soaps etc that would make it
hard.
So yes you can use softened water as an intermediate
rinse, but clearly water softened as above will leave the dissolved salts on
your work if used in the final
rinse.
The reason for using softened water is that it usually
much cheaper than DI water.
Regards
Mike Fenner
Applications
Engineer, European Operations
Indium Corporation
T: +
44 1908 580 400
M: + 44 7810 526 317
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44 1908 580 411
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www.indium.com
Pb-free:
www.Pb-Free.com
Fellow Techies,
Hopefully, someone can shed some light on my concern
about rinsing boards (soldered with water soluble flux) with softened water vs.
DI water.
A board assembly house suggested that it is
acceptable to do in-process rinsing using "softened" water (in an in-line
cleaner) and save the "DI water" rinse for the FINAL in-line cleaning.
In-process cleaning would be for example after the 1st side is soldered on a
double sided board. Seems like a lot of extra work to me switching from
softened to DI water.
Look forward to your comments.
thanks
joe
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