We use carbon (activated charcoal) before chelate and the mixedbeds which adsorbs the organics prior to ion exchange. When foaming starts to become an issue, we change the carbon. We don't use a lot of the dissopads, so that's probably a factor as well.
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: TechNet [mailto:[log in to unmask]] On Behalf Of Bush, Brien
Sent: Thursday, October 17, 2013 5:41 AM
To: [log in to unmask]
Subject: Re: [TN] Charred dissopad residue
Hi Ed,
I was just curious to see if you are using DI closed loop wash system. We had to stay away from the wash away spacers because they Were causing problems with our mixed resin beds. Have you had any issues?
Regards,
Brien
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bob Landman
Sent: Thursday, October 10, 2013 5:36 PM
To: [log in to unmask]
Subject: Re: [TN] Charred dissopad residue
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&s
> pn=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&s
> pn =0.011188,0.033023&ctz=420&t=m&z=16&iwloc=A
>
>
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