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From: Reagan Thomas
X-Mailer: Mozilla 4.79 [en] (Windows NT 5.0; U)
Subject: Re: Washing PCB's after soldering...with what?
Date: Thu, 21 Nov 2002 03:52:33 -0600
NNTP-Posting-Date: Thu, 21 Nov 2002 03:51:16 CST
PCS Electronics wrote:
> We're hand-soldering (small series) our PCBs and are
> wondering what would be the best chemical for washing
> the boards afterwards.
> We've tried Acetone and Ethanol, the first is way too strong as
> it melts the caps and other plastic, the second (Ethanol - alcohol)
> leaves the PCB looking very dry and ugly with white powder
> where the soldering paste used to be.
> Does anyone here have experience with this kind of stuff?
> Best regards,
> Marko - PCS Electronics
> Turn your PC into a FM radio station!
> tel +386 31 318 236
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> message in your responses. This will greatly speed up future
We use OS-459 from OS TECH (Oliver Sales Co.)
It is an aqueous rosin flux remover that can be used in a dip or
spray operation. They recommend heating the water/remover solution
to around 120F for dip operations, immediate (don't allow solution to
dry on parts) rinsing with deionized or distilled water followed by
forced air drying.
We generally soak our parts for about an hour, clean any remaining
flux off with a firm brush (wear gloves!), rinse with tap water and
then place them in racks (2x4's or 2x6's with slots cut in them) to
dry in front of a large fan. The tap water may leave deposits on the
boards if it's hard, so DI or distilled may be a better choice.
BTW, when mixed down in the correct proportions in water, it smells
suspiciously like Formula 409.
Their web site is at http://www.os-tech.com/ but I didn't see this
specific product mentioned there just now. Hmmm.
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