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June 2004

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Subject:
From:
David Douthit <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 24 Jun 2004 13:09:43 -0700
Content-Type:
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text/plain (237 lines)
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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