I sent the to Steve. Cheers Günter >-----Ursprüngliche Nachricht----- >Von: TechNet [mailto:[log in to unmask]] Im Auftrag von Victor Hernandez >Gesendet: Freitag, 6. Juli 2012 17:55 >An: [log in to unmask] >Betreff: Re: [TN] Copper Dendrites > >What happened to the pictures? > >Victor, > >-----Original Message----- >From: TechNet [mailto:[log in to unmask]] On Behalf Of Paul Reid >Sent: Friday, July 06, 2012 10:33 AM >To: [log in to unmask] >Subject: Re: [TN] Copper Dendrites > >Ah, Now I understand. > >Conductive filaments can grow particularly conductive anodic filaments. >I was thinking of a dendrite of copper not conductive filaments. I >expect dendrites to be larger and of pure copper but you may get >dendritic growth with a contaminate, in the presents of water and with >an electrical potential. > >Sorry for my misunderstanding. > >Sincerely, > > > >Paul Reid > >Program Coordinator > >PWB Interconnect Solutions Inc. >235 Stafford Rd., West, Unit 103 >Nepean, Ontario Canada, K2H 9C1 > >613 596 4244 ext. 229 > >Skype paul_reid_pwb >[log in to unmask] > > > > >-----Original Message----- >From: TechNet [mailto:[log in to unmask]] On Behalf Of Guy Ramsey >Sent: July 6, 2012 9:23 AM >To: [log in to unmask] >Subject: Re: [TN] Copper Dendrites > >I agree. I have seen dendrites grow under solder mask from on conductor >to another, and from a PTH to a conductor, under solder mask. > >If the residue were benign, until exposed to water, and the coating were >to protect it from exposure, it could help. > >Still, I am skeptical, that it would reduce risk of failure. It would >need to be a designed process, not a band aid. > >It might make things worse. > >Guy > >-----Original Message----- >From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Naisbitt >Sent: Friday, July 06, 2012 8:23 AM >To: [log in to unmask] >Subject: Re: [TN] Copper Dendrites > >Hi Neil > >I stand by my earlier posting on this. Neither a solder resist nor a >conformal coating will PREVENT dendrites, they might delay it for a >while, but then what is lurking and festering underneath..just when you >thought it was safe to go back in the water!? > >Graham Naisbitt > > >On 5 Jul 2012, at 19:50, Neil Atkinson wrote: > >> Thanks everyone for comments so far - haven't been on Technet for a >while >so it was good to get such good responses. >> >> Really miss Werner for questions like this... >> >> Actually we have never seen a failure for dendrites; however, we have >a >customer who has a past problem with another supplier due to dendrites >on PCBs and as a result wants us to cover vias with solder resist or >conformal coating. >> >> Tha, >> >> Neil >> >> ______________________________________________________________________ >> This email has been scanned by the Symantec Email Security.cloud >service. >> For more information please contact helpdesk at x2960 or >> [log in to unmask] >> ______________________________________________________________________ > > >______________________________________________________________________ >This email has been scanned by the Symantec Email Security.cloud >service. >For more information please contact helpdesk at x2960 or >[log in to unmask] >______________________________________________________________________ > > >______________________________________________________________________ >This email has been scanned by the Symantec Email Security.cloud >service. >For more information please contact helpdesk at x2960 or >[log in to unmask] >______________________________________________________________________ > >______________________________________________________________________ >This email has been scanned by the Symantec Email Security.cloud >service. >For more information please contact helpdesk at x2960 or >[log in to unmask] >______________________________________________________________________ > >______________________________________________________________________ >This email has been scanned by the Symantec Email Security.cloud >service. >For more information please contact helpdesk at x2960 or >[log in to unmask] >______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________