Oh, the passion of cleaning...., by far these type of TN questions receive the fastest and most replies.
No clean (a.k.a. Low residue) solder paste is formulated to be non-ionic in
nature, require a moderate to narrow process window, have good rehology,
good tack and wet life. The no clean solder pastes have become the industry
standard and represent about 65% of solder paste market. Most no clean
fluxes can be cleaned with aqueous, semi-aqueous and vapor phase cleaning
technologies. The need or benefit of cleaning is representative of the
application and reliability requirements. (MB)
With the all the benefits of using these new paste formulas, having the option to clean is not as difficult as it was even 5 years ago. I know a few commercial, military including aerospace and auto suppliers that are doing what Lealand is asking and have been successfully for years. It is not smoking rocks and voodoo. It does however require a controlled cleaning process.
Once this is worked through and if followed will leave a component that can have many years of reliable service life.
Whether you are using just water or chemistry to clean you will need a process. Is this pro or con..? Yes cleaning is an added expense, but is this pro or con...? If it adds value, etc. to a high rel component, then.. ?
Leland feel free to call or e-mail me off-line.
Regards
Charlie Pitarys
Director of Application Technologies
603.622.2900 X-115
www.kyzen.com
-----Original Message-----
From: Leland Woodall [mailto:[log in to unmask]]
Sent: Wednesday, May 08, 2002 3:42 PM
To: [log in to unmask]
Subject: [TN] Cleaning of No-clean Assemblies
Folks,
We've been asked to investigate the pros and cons of performing an aqueous
wash of our no-clean assemblies prior to them receiving an acrylic conformal
coating. Our management team wants the product to be absolutely free from
any type of contamination.
Has anyone had any experience with this? What are the possible advantages
and some of the pitfalls we could anticipate?
Are there any knowledge sources that you might be able to recommend?
Any assistance would be sincerely appreciated.
Regards,
Leland Woodall
Quality Coordinator
Keihin Carolina System Technology, Inc.
4047 McNair Road
Tarboro, NC 27886
Phone: 252-212-1565, ext. 2865
---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
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 delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL
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/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------