So you are trying to remove salty caramel then. Probably will be ionic and
hydroscopic, so that's bad news.
If the stuff has run under components then it will take time to be leached
out in a wash process.
Possibly you could reheat the boards and wick it off or blow it out, but no
doubt you don't have a lot of assemblies to practice on. Most likely you
will need a detergent based wash process, whatever pre-treatment you run.
The difficulty will be balancing your cleaning efforts against the risk of
damage to laminate/inks/masks.
I think you will need to contact Kyzen Zestron et al and ask for their best
effort/advise.
Best Wishes
Mike-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ed Popielarski
Sent: Thursday, October 10, 2013 10:22 PM
To: [log in to unmask]
Subject: Re: [TN] Charred dissopad residue
Bivar uses lactose and sodium chloride. So now the question is "should we
cry over burnt milk"?
Ed Popielarski
Engineering Manager
970 NE 21st Ct.
Oak Harbor, Wa. 98277
Ph: 360-675-1322
Fx: 206-624-0965
Cl: 949-581-6601
https://maps.google.com/maps/myplaces?hl=en&ll=48.315753,-122.643578&spn=0.0
11188,0.033023&ctz=420&t=m&z=16&iwloc=A
-----Original Message-----
From: Steve Gregory [mailto:[log in to unmask]]
Sent: Thursday, October 10, 2013 2:19 PM
To: [log in to unmask]; Ed Popielarski
Subject: RE: [TN] Charred dissopad residue
Hey Ed,
Haven't run across that problem (yet), and don't really know how to clean
that. But I did run across another brand of spacers that I didn't know about
before that's made of different material than what Bivar dissolvable spacers
are made of...aren't bivar spacers made of some sort of sugar ?
http://www.multi-seals.com/washawayspacers.php
They're made of something called Polyvinylpyrrolidone, and contain no
ionizable material, salts, sugars, metals, or soaps, and they are
non-corrosive, non-conductive, and non-toxic.
I just found them in a search today. I'm getting a sample pack of them sent
to me check them out myself, you might check them out too if you've never
tried them.
Steve
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ed Popielarski
Sent: Thursday, October 10, 2013 2:31 PM
To: [log in to unmask]
Subject: [TN] Charred dissopad residue
Hi all,
Had an odd problem today.
We have built many of these assemblies with tin/lead solder but just now
switched to lead free solder (higher temperature).
The "Dissopad" contacting the PCB (at a via) liquefied, spread and charred.
The residue is very difficult to remove, especially a concern since it is
under components and could be "conductive". (pix available on request)
We tried cleaning this with isopropyl alcohol and it didn't seem to dissolve
the charred residue at all.
I soaked one PCB in 140F DI water for 30 min. and re-cleaned in the aqueous
cleaner. It did seem to remove the heavier residue, but there remains a film
and smaller clumps on the board surface.
Any suggestions would be appreciated!
Ed Popielarski
Engineering Manager
[Description: FullLogo]
970 NE 21st Ct.
Oak Harbor, Wa. 98277
Ph: 360-675-1322
Fx: 206-624-0965
Cl: 949-581-6601
https://maps.google.com/maps/myplaces?hl=en&ll=48.315753,-122.643578&spn
=0.011188,0.033023&ctz=420&t=m&z=16&iwloc=A
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