TECHNET Archives

February 2008

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Blair Hogg <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Blair Hogg <[log in to unmask]>
Date:
Thu, 21 Feb 2008 14:52:38 -0600
Content-Type:
text/plain
Parts/Attachments:
text/plain (29 lines)
We are having an issues with printed circuit boards showing residues, 
that become more prevalent after heating cycles. It leaves a shiny / oily 
looking film that is somewhat splotchy. Sorry for all these technical 
terms. 

I'm suspecting undercured epoxy, and I am currently looking to send 
some out for chemical analysis. I have one lab quoting IC, and another's 
website also recommends FT-IR. The supplier performed a ROSE test 
and says there is no ionic contamination. The biggest problem we are 
having is with conformal coating adherance. Due to certain components 
on the one board that gives us trouble we aren't able to run it trhough 
our aqueous wash cycle. 

Is Ion Chromatography the right test? Any other suggestions?

Thanks,

Blair

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
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 847-615-7100 ext.2815
-----------------------------------------------------

ATOM RSS1 RSS2