Is it possible that No-Clean process could be the problem? (i.e. type of
flux)
-----Message d'origine-----
De : Lenny Carter [mailto:[log in to unmask]]
Envoyé : 26 avril 2011 16:35
À : 'TechNet E-Mail Forum'; 'Jean-Francois Bissonnette'
Objet : RE: [TN] White solder mask discoloration
We had a couple batches of aluminum clad pcbs for Led lighting that turned
"pinkish" after reflow.
Discussions with the pcb vendor revealed a potential problem with gloss
white mask product the were using. They sampled us the same pcbs using
another white gloss mask, which we ran using the same processes and reflow
profile, and didn’t have the problem. The pcb vendor has changed their
white mask recipe as a result, and we have not seen it since.
Lenny Carter
Design Engineer
ERG, Inc.
ph:(607) 754-9187 x3063
www.ergpower.com
www.erglighting.com
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jean-Francois
Bissonnette
Sent: Tuesday, April 26, 2011 4:23 PM
To: [log in to unmask]
Subject: Re: [TN] White solder mask discoloration
Hello again,
Just realized that I forgot an important detail. It is in fact metal core
(Al). Thank you all for your answers. Still investigating the problem, I
will give feedback as soon as we pinpoint the problem...
JF
-----Message d'origine-----
De : TechNet [mailto:[log in to unmask]] De la part de Dennis Fritz
Envoyé : 25 avril 2011 14:50
À : [log in to unmask]
Objet : Re: [TN] White solder mask discoloration
Most recently, I had seen white solder mask on boards (metal core?) going to
the LED lighting industry (reflectors). I understand the IPC effort on
boards for LED lighting was being centered on the China office. I have
copied David Bergman of IPC on this response, as he may provide links to all
kinds of technology for white mask.
-----Original Message-----
From: Jean-Francois Bissonnette <[log in to unmask]>
To: TechNet <[log in to unmask]>
Sent: Fri, Apr 22, 2011 9:19 am
Subject: [TN] White solder mask discoloration
Hi Technetters,
Does anyone have experience with white solder mask? Any chances of success
assing these through reflow without discoloration?
We had a bunch of them sent to our CM and they all came back with a yellow
o brown discoloration. I believe there are different types of solder masks
ut there but is there some standard regarding their capacity to resist
eat? The process used it RoHS.
Thanks in advance!
Jean-François Bissonnette
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