Ioan:
I'd like to reinforce Doug Pauls' comment on cleaning water soluble?residues.
From?a rework perspective, please don't even let?water soluble flux into the rework area unless the the PCBs can be power-washed after rework. Have seen some awful field returns reworked with water soluble flux that might have been hand-cleaned, at best.
Good luck.
Doug Peck
-----Original Message-----
From: Douglas O. Pauls <[log in to unmask]>
To: [log in to unmask]
Sent: Wed, 19 Nov 2008 11:21 am
Subject: Re: [TN] WS solder paste
Ioan,
In addition to the other suggestions given so far, do not EVER EVER EVER
believe the salesman when they tell you that water soluble flux can be
cleaned using water alone. It can't. And if they tell you that tap water
cleaning works fine, throw them out the door.
Most of the cleaning chemical vendors, such as Kyzen, Petroferm, Zestron,
can give you good data on what materials work best to ensure cleaning
under low standoff parts.
Doug Pauls
Rockwell Collins
Ioan Tempea <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
11/18/2008 09:44 PM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
Ioan Tempea <[log in to unmask]>
To
[log in to unmask]
cc
Subject
[TN] WS solder paste
Dear Technos,
After having worked for years with no-clean pastes, I need now to
evaluate water soluble. Concerning both SnPb and lead-free, what would
be your short list to start qualifications?
We are a CEM, so the paste needs to be very versatile, so it can give
the best performance (compromise) for inconsistent designs. In this
world we need to print everyday a wide range of designs like 20mil fine
pitch pads with widths from 9 to 15 mils, 0603s with pad gaps between 20
and 35 mils, etc., so I guess most of you understand what I mean by
versatile ;-)
I assume off-line answers would be appropriate, so please do not
hesitate...
Thank you,
Ioan
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