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
F: + 44 1908 580 411
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Macko, Joe @ IEC
Sent: Wednesday, August 20, 2003 12:02 AM
To: [log in to unmask]
Subject: [TN] water soluble flux in line cleaner water wash
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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