TECHNET Archives

March 1998

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:
Re: Conformal Coating Dewetting
From:
Fred2537 <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 13 Mar 1998 12:06:30 EST
Content-Type:
text/plain
Parts/Attachments:
text/plain (21 lines) 
It is apparent that you have a contaminant which is rising to the surface of
the LPI after curing.  This is verified by the fact that when you clean with
alcohol it improves. My suggestion to you is to have an FT-IR run on the
surface and see if you can determine traces of silcone or a plasticizer which
will give a similar affect of de-wetting. One possible solution is to flame
treat the boards prior to putting the conformal coat on. This will burn off
the surface contaminant and allow the coating to adhere. As far as long term
effects, there are no answers.

################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe:   SUBSCRIBE TechNet <your full name>
To unsubscribe:   SIGNOFF TechNet 
################################################################
Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information.
For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311
################################################################

ATOM RSS1 RSS2