Hi Steve,
Could you please post the attached?
Ed Popielarski
Engineering Manager
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From: Steve Gregory [mailto:[log in to unmask]]
Sent: Wednesday, October 07, 2015 2:15 PM
To: TechNet E-Mail Forum; Ed Popielarski
Subject: Re: [TN] ENIG VS. ammonia
Hi Ed,
I use peelable latex mask quite often here (mostly for conformal coat masking) and have never had it tarnish ENIG. I do know that some masks contain some ammonia (some formulations more than others) and the ones that do usually have a note not to use on OSP finishes, but I've not seen such a note for ENIG. IHMO you got something else going on there besides the peelable mask causing the problem...
Steve
On Wed, Oct 7, 2015 at 2:46 PM, Ed Popielarski <[log in to unmask]<mailto:[log in to unmask]>> wrote:
Hi all,
I Have a batch of boards showing what I believe to be black pad. This is surfacing at thru hole (solderability, some pads are turning orange). One person suggested the peelable solder mask contains ammonia and this is what is causing it. I disagree.
Suggestions or comments?
Ed Popielarski
Engineering Manager
[cid:[log in to unmask]]
970 NE 21st Ct.
Oak Harbor, Wa. 98277
Ph: 360-675-1322<tel:360-675-1322>
Fx: 206-624-0695<tel:206-624-0695>
Cl: 949-581-6601<tel:949-581-6601>
"It's one kind of victory to slay a beast, move a mountain, and cross a chasm, but it's another kind altogether to realize that the beast, the mountain, and the chasm were of your own design."
https://maps.google.com/maps/myplaces?hl=en&ll=48.315753,-122.643578&spn=0.011188,0.033023&ctz=420&t=m&z=16&iwloc=A
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