Have been building PCAs, not for LED illuminators, with "white" soldermask for ~2.5 yrs... Have seen no problems except when soldermask coating was thin and PCB bulk material showed through and when someone used a hot air gun when they shouldn't have...
Paul
Paul Edwards
Process/Quality Engineering
Surface Art Engineering
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Richard D. Krug
Sent: Tuesday, April 26, 2011 4:36 AM
To: [log in to unmask]
Subject: Re: [TN] White solder mask discoloration
As an EMS provider, we soldered our first CCA's with white solder mask within the past month. I hadn't heard of any discoloration. Based on this query, I looked at a raw PWB and finished assembly next to each other yesterday under office area lighting. I couldn't see any difference in the color. This was not "measured", but was critically reviewed.
Dick Krug, CSMTPE
SMT Process Engineer
Sparton Corporation
30167 Power Line Road
Brooksville, FL 34602-8299
p (352) 540-4012 (Internal Ext. 2012)
[log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jean-Francois Bissonnette
Sent: Friday, April 22, 2011 9:20 AM
To: [log in to unmask]
Subject: [TN] White solder mask discoloration
Hi Technetters,
Does anyone have experience with white solder mask? Any chances of success
passing these through reflow without discoloration?
We had a bunch of them sent to our CM and they all came back with a yellow
to brown discoloration. I believe there are different types of solder masks
out there but is there some standard regarding their capacity to resist
heat? 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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