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April 2011

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From:
"Whittaker, Dewey (EHCOE)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Whittaker, Dewey (EHCOE)
Date:
Mon, 25 Apr 2011 12:05:44 -0700
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We worked on this for lighting panels on displays. The initial attempts had too much light absorption, but second generation gave favorable results. I do not have any long term durability numbers yet on how it would age, but certainly yellowing would affect the reflectivity capability.
Dewey  
 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dennis Fritz
Sent: Monday, April 25, 2011 11:50 AM
To: [log in to unmask]
Subject: 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
DEPRO Électronique Inc
755, Curé-Boivin suite 101
Boisbriand, Québec
Canada     J7G 2J2
Ph. 450.430.6251  Poste/Ext: 109
Fax: 450.430.6251
 

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