there is no dew or not to dew -- there is only 'it depends' From: Phil Bavaro <[log in to unmask]> To: <[log in to unmask]> Date: 28/10/2011 02:05 PM Subject: Re: [TN] FW: [TN] Rookie question on RMA fluxes Sent by: TechNet <[log in to unmask]> Forgot one.... Dew or not to Dew -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey (EHCOE) Sent: Friday, October 28, 2011 10:25 AM To: [log in to unmask] Subject: [TN] FW: [TN] Rookie question on RMA fluxes Speaking of an Apocalypse; I love the smell of RMA in the morning. All paste/flux compositions/combinations have their limitations (you thought I was going to say prose and cons). You need to identify them and the resultant compatibilities or the lack there-of. Some are as follows: * Clean or not to clean * Bake or not to bake * Coat or not to coat * Test or not to test * Time or not to time (mandate or need to have minimum time to clean after reflow) * Mask or not to mask (SMOBC or resist) * End-use environment or not * High Solids content or marginally so * IC or Church of Scientology * SIR or hey you I don't know if you can truly get a RMA anymore, but they certainly have washed up many careers. Stay thirsty my friends (for knowledge that is) and you can choose/create the process that best suits your product/customer requirements. Dewey -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Robert Kondner Sent: Friday, October 28, 2011 7:08 AM To: [log in to unmask] Subject: Re: [TN] Rookie question on RMA fluxes As my neurons warm up I recall: I loved RMA, great flux and non-corrosive. If it "Got Stuck" under components no big deal. Get OA trapped under parts with vias and it is all over in 5 years or less. My issue with cleaning was we wound up doing 2 cleaning cycles. The first was after wave or reflow. This got the board clean so it could be easily handled. After rework we cleaned again. We were building board level products so they had to "Look Good" which meant no spots of flux where THT or touch up had been performed by hand. We used OA for THT and rework which cleaned up in plain water fine. Bob K. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Amol Kane Sent: Friday, October 28, 2011 9:53 AM To: [log in to unmask] Subject: Re: [TN] Rookie question on RMA fluxes Ioan, We use RMA flux on a regular basis. Would you be using it on SMT and/or wave?.....as phil mentioned, RMA flux needs to be cleaned in a saponified wash. Alcohol is a very bad de-fluxer in general and should not be used on RMA fluxes. In case of spot/hand cleaning, we use the Ensolv aerosol cleaner. Amol Kane | Process Engineer Catalyst Manufacturing Services, Inc. 941 Route 38, Owego NY 13827 Phone: (607) 687-7669 Extn 349 | Website: www.catalystems.com -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Nutting Sent: Friday, October 28, 2011 9:45 AM To: [log in to unmask] Subject: Re: [TN] Rookie question on RMA fluxes Ioan, "Flux for Dummies" version; RMA flux works just fine with the correct processing. If you are locked in to the RMA, then cleaning will best be done with a saponifier in a water wash system. Alcohol only does a good job of diluting the flux and spreading it over the entire board. Water soluble flux (OA) will work just fine, but again with the appropriate wash and dry. My engineers were leery of OA flux until I produced boards that were cleaner than we had ever gotten. Now it is all they will accept. I am sure there are some of our TechNet friend out there that can give a much more detailed response. Regards, Phil Nutting -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Ioan Tempea Sent: Friday, October 28, 2011 9:08 AM To: [log in to unmask] Subject: [TN] Rookie question on RMA fluxes Dear Technos, Although I've been around in this trade of ours for quite a while now, I have never had the occasion to work with RMA fluxes. I need to know how this functions. How can RMA be cleaned, I've heard about alcohol...? Is regular aqueous wash enough? If alcohol only, do we need a special equipment? Anything else to know? And, anyways, are RMA fluxes still available? Also, I imagine most of you at ease with RMA have tried to talk your customers into converting to water soluble flux chemistries. How hard was that? Is it possible? Thanks, Ioan Tempea, ing. 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