Doug,
Apparently after 38 years of "Star Trek" I have reached saturation!!!!
Thanks for the correction!
David A. Douthit
Manager
LoCan LLC
Douglas O. Pauls wrote:
>Joe,
>So, in summary, you can have water soluble flux residues, RMA flux
>residues, and low solids flux residue? I agree with others that you have a
>potentially dangerous mix of fluxes. And you wish to go from an in-line
>cleaner, which has generally better cleaning, to a batch cleaner, which
>gives more variable cleaning? As to recommendations, try Austin America
>Technologies (AAT), which make a pretty good line of cleaners. I recommend
>Kyzen products for cleaning. Their Aquanox line is pretty good, especially
>the new stuff, and should be able to clean all the flux chemistries in your
>flux soup.
>
>I must say that the term "vulcanization of flux residues" is a new one to
>me. Vulcanization refers to a polymerization action that occurs in rubbers
>and some silicone based adhesives. Flux residues have neither. A more
>appropriate term would be unreacted flux. Low residue fluxes must reach a
>minimum temperature, called the activation temperature, before all the
>carrier solvent is driven off and the residues change chemically to a
>benign condition. That is why the flux manufacturers recommend putting as
>little low solids flux on as possible. Have you considered not cleaning
>your low residue flux?
>
>And now Dewey can start thinking of a suitable Trek tie in. Must be a hot
>one down in Phoenix today.......
>
>Doug Pauls
>
>
>
>
> "Macko, Joe @
> IEC" <joe.macko To: [log in to unmask]
> Sent by: TechNet cc:
> <[log in to unmask]> Subject: Re: [TN] circuit board batch cleaner recommendation
>
>
> 06/24/2004 11:33
> AM
> Please respond to
> "TechNet E-Mail
> Forum."; Please
> respond to
> "Macko, Joe @
> IEC"
>
>
>
>
>
>
>
>Ramon,
>
>Thanks for the feedback. Our venders are using water soluble type fluxes
>which are cleaned at their facility using aqueous in-line cleaners and
>verified by random Omegameter and visual tests. We had not had any
>problems
>receiving uncleaned boards from our CMs.
>
>joe
>
>-----Original Message-----
>From: Dehoyos, Ramon [mailto:[log in to unmask]]
>Sent: Thursday, June 24, 2004 9:27 AM
>To: [log in to unmask]
>Subject: Re: [TN] circuit board batch cleaner recommendation
>
>
> Hi Joe:
> The questions is what type of flux is used by your vendor?
> You may be mixing three types of flux, which is not a good idea.
> Regards,
> Ramon
>
>-----Original Message-----
>From: David Douthit [mailto:[log in to unmask]]
>Sent: Thursday, June 24, 2004 11:58 AM
>To: [log in to unmask]
>Subject: Re: [TN] circuit board batch cleaner recommendation
>
>
>Joe,
>
>The use of "No-Clean" for rework is problematic. Unvulcanized flux will go
>places where it can not be removed. The best method to deal with this is to
>run the boards back through an oven and make sure the entire board reaches
>a high enough temperature to vulcanize the remaining flux.
>
>If there is a combination of fluxes on the board you are in serious
>trouble.
>Do all the RMA rework and clean-up prior to "No-Clean" rework.
>
>Hope this helps.
>
>David A. Douthit
>Manager
>LoCan LLC
>
>Macko, Joe @ IEC wrote:
>
>
>
>>Fellow Technets,
>>
>>We are looking at switching to a "batch" type cleaner from our WESTEK
>>in-line cleaner for circuit boards. We outsource all of our board
>>
>>
>assembly
>
>
>>so we do not have to worry about cleaning screens, etc.. Our boards are
>>densely populated, double sided with multiple BGAs on both sides. We use
>>wire form, RMA cored solder for in-house rework and touch up. Use NC for
>>BGA rework.
>>
>>Looking for some recommendation / comments on what fellow techs are using
>>
>>
>to
>
>
>>successfully clean their boards - make, model, etc.... Their seem to be a
>>lot of units out there. Thanks
>>
>>joe
>>
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