Chris, I'll try to attach them here. The pics labelled PinkRing are ground looking down into the PWB (transverse mount).Darkfield views are named with a 'DF' within.The pics labelled Wedge are an example of pink ring in the presence of a wedge void.Many instances of pink ring were at the time initiated by wedge voids.In some cases delamination was also seen to be initiated by larger wedge voids. Gerry > Date: Thu, 28 Aug 2008 21:14:14 -0400> From: [log in to unmask]> Subject: Re: [IPC-600-6012] Pink ring, lam void, or delam?> To: [log in to unmask]> > Gerry,> Yep. I took a little artistic license. I should have said 'it would be kinda like the adhesion issue that allows acids in and leads to pink ring (which the industry decided was more/less acceptable).> If you have good pictures, post 'em. I'm pretty sure that this group can attach image files. We have special permission. Maybe John Perry will snatch them up for A-600.> Chris> > -----Original Message-----> From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of Gerald Gagnon> Sent: Thursday, August 28, 2008 3:09 PM> To: [log in to unmask]> Subject: Re: [IPC-600-6012] Pink ring, lam void, or delam?> > Hi Chris!> > Pink ring has a very specific cause and distinct appearance. It is lateral removal of the innerlayer copper bonding treatment (oxide or other) by acidic pre-dips in deposition line. Some innerlayer bonding treatments are/were specifically designed NOT to be soluble in dep chemistries, hence eliminating pink ring.> > I have some nice horizontal mounted x-section color shots of pink ring. Spectacular colors in the originals. If you are interested I can post.> > BTW - how do I post pictures without getting them stipped out by the email?> > Regards,> > Gerry Gagnon> > > Forwards deleted <> -----Original Message-----> From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of Chris> Mahanna> Sent: Thursday, August 28, 2008 6:05 AM> To: [log in to unmask]> Subject: [IPC-600-6012] Pink ring, lam void, or delam?> > Hello group,> > Robisan has treated resin recession from the inner foils as 'voids in> the thermal zone'. If the void/adhesion issue on the top/bottom> (usually the oxide/non-tooth/pre-preg) side is small enough, everyone> would agree that it's just pink ring.> But, I have a customer who wishes to argue that it should be classified> as delam. Why? So they can fail it in the thermal zone, of course.> Please see the attached presentation that they produced for us.> > Any thoughts?> > Thanks,> Chris> > Chris Mahanna> Robisan Laboratory Inc.> _________________________________________________________________> See what people are saying about Windows Live. Check out featured posts.> http://www.windowslive.com/connect?ocid=TXT_TAGLM_WL_connect2_082008
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