Bob,
Yes, this is where the "it depends" comes into play. What is the use of the board, the environment, etc.
Phil
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bob METCALF
Sent: Friday, October 28, 2011 11:36 AM
To: [log in to unmask]
Subject: Re: [TN] Rookie question on RMA fluxes
George,
My recollection of RMA fluxes was we needed to clean after soldering, usually with a high temp wash with a saponifier. Again I am reaching back in my memory but I don't recall it being acceptable to leave the RMA flux residues on the board as the residue was still active.
Anyone please correct me if I am wrong in my recollection. Maybe it might be more application dependent?
Regards,
Bob Metcalf
Western Regional Manager
Atotech USA Inc
1750 Overview Drive
Rock Hill, South Carolina 29730 USA
Mobile: 714-334-7667
e-mail: [log in to unmask]
Internet: www.atotech.com
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From: "Wenger, George M." <[log in to unmask]>
To: <[log in to unmask]>
Date: 10/28/2011 07:18 AM
Subject: Re: [TN] Rookie question on RMA fluxes
Sent by: TechNet <[log in to unmask]>
RMA fluxes that passed the Bellcore compliant "leave behind" tests were used for many many years by Western Electric / AT&T / Bell Labs / Lucent Technologies for high reliability telecommunication products with great success. The only time you have problems with RMA flues is when you try and clean them and don't do a good job of cleaning them. Solder with them and "leave them behind" (i.e., don't clean).
Regards,
George
George M. Wenger
Senior Principal Reliability / FMA Engineer Andrew Corporation - Wireless Network Solutions
40 Technology Drive, Warren, NJ 07059
(908) 546-4531 Office (732) 309-8964 Mobile
E-mail: [log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Robert Kondner
Sent: Friday, October 28, 2011 10:08 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.
Ingénieur Principal de Fabrication / Senior Manufacturing Engineer T |
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