Maybe your boards are lactose intolerant? 

Do you have to go lead-free? Thankfully we do not.

Bob

Sent from my iPhone

On Oct 10, 2013, at 5:21 PM, Ed Popielarski <[log in to unmask]> wrote:

> 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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