Electronics Forum | Fri May 08 21:53:07 EDT 2009 | kareal
X-section image: tin layer on top of copper trace.
Electronics Forum | Sat May 09 09:40:12 EDT 2009 | davef
The whitish tin layer and the solder mask appear to be incompatible, resulting in adhesion loss.
Electronics Forum | Thu Jun 18 07:04:12 EDT 2009 | davef
We'd call it delamination and ask our board fabrictor to come over and -off replacement baords.
Electronics Forum | Fri Apr 16 10:49:55 EDT 2010 | davef
Your picture is not very useful in conveying the stains. Could the stains be a delamination of the board?
Electronics Forum | Mon Jun 13 17:23:07 EDT 2011 | grics
What are your Bake Requirements? As in temp, duration, etc...
Electronics Forum | Fri Jun 01 05:12:09 EDT 2012 | aj
could be down to board design also - are you seeing the delam in the same area all the time?
Electronics Forum | Tue Jun 05 06:35:01 EDT 2012 | mosborne1
It's called pink ring.
Electronics Forum | Thu Apr 04 06:00:24 EDT 2013 | susanc
Okay, i got the concept. What are advantages of using pink ring? http://www.ccsintlcircuits.com/flexiblepcb.html
Electronics Forum | Fri Aug 09 12:04:45 EDT 2013 | horchak
well now the truth comes out, and nothing like the smell of burning fiber glass in the morning lol
Electronics Forum | Mon Sep 09 21:58:34 EDT 2013 | mandysmile
there is another reason, find the reason from the base material.
