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 >> >>--------------------------------------------------- >>Technet Mail List provided as a service by IPC using LISTSERV 1.8e >>To unsubscribe, send a message to [log in to unmask] with following text in >>the BODY (NOT the subject field): SIGNOFF Technet >>To temporarily halt or (re-start) delivery of Technet send e-mail to >> >> >[log in to unmask]: SET Technet NOMAIL or (MAIL) > > >>To receive ONE mailing per day of all the posts: send e-mail to >> >> >[log in to unmask]: SET Technet Digest > > >>Search the archives of previous posts at: http://listserv.ipc.org/archives >>Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 >> >> >for additional information, or contact Keach Sasamori at [log in to unmask] or >847-509-9700 ext.5315 > > >>----------------------------------------------------- >> >> >> >> >> >> > >--------------------------------------------------- >Technet Mail List provided as a service by IPC using LISTSERV 1.8e >To unsubscribe, send a message to [log in to unmask] with following text in >the BODY (NOT the subject field): SIGNOFF Technet >To temporarily halt or (re-start) delivery of Technet send e-mail to >[log in to unmask]: SET Technet NOMAIL or (MAIL) >To receive ONE mailing per day of all the posts: send e-mail to >[log in to unmask]: SET Technet Digest >Search the archives of previous posts at: http://listserv.ipc.org/archives >Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 >for additional information, or contact Keach Sasamori at [log in to unmask] or >847-509-9700 ext.5315 >----------------------------------------------------- > >--------------------------------------------------- >Technet Mail List provided as a service by IPC using LISTSERV 1.8e >To unsubscribe, send a message to [log in to unmask] with following text in >the BODY (NOT the subject field): SIGNOFF Technet >To temporarily halt or (re-start) delivery of Technet send e-mail to >[log in to unmask]: SET Technet NOMAIL or (MAIL) >To receive ONE mailing per day of all the posts: send e-mail to >[log in to unmask]: SET Technet Digest >Search the archives of previous posts at: http://listserv.ipc.org/archives >Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 >for additional information, or contact Keach Sasamori at [log in to unmask] or >847-509-9700 ext.5315 >----------------------------------------------------- > >--------------------------------------------------- >Technet Mail List provided as a service by IPC using LISTSERV 1.8e >To unsubscribe, send a message to [log in to unmask] with following text in >the BODY (NOT the subject field): SIGNOFF Technet >To temporarily halt or (re-start) delivery of Technet send e-mail to >[log in to unmask]: SET Technet NOMAIL or (MAIL) >To receive ONE mailing per day of all the posts: send e-mail to >[log in to unmask]: SET Technet Digest >Search the archives of previous posts at: http://listserv.ipc.org/archives >Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 >for additional information, or contact Keach Sasamori at [log in to unmask] or >847-509-9700 ext.5315 >----------------------------------------------------- > >--------------------------------------------------- >Technet Mail List provided as a service by IPC using LISTSERV 1.8e >To unsubscribe, send a message to [log in to unmask] with following text in >the BODY (NOT the subject field): SIGNOFF Technet >To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) >To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest >Search the archives of previous posts at: http://listserv.ipc.org/archives >Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 >----------------------------------------------------- > > > > --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------