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=0.011188,0.033023&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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