JF,

I am short on particulars but have your fab shop check with their solder
mask vendor as I know that there is work being done on the formulations of
white mask by a number of manufacturers for this very reason.

Regards,
John Parsons

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jean-Francois
Bissonnette
Sent: Tuesday, April 26, 2011 1:23 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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