Mark, there are many OSP. Immidisole for example. entek is the trade name of bensotriazole, there are entek plus... you really need to know what you are use it for.. my 2 cents. jk On Aug 15, 2014, at 3:48 PM, Larson, Mark wrote: > I can answer my own question, Benzotriazole is OSP > > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Larson, Mark > Sent: Friday, August 15, 2014 2:36 PM > To: [log in to unmask] > Subject: Re: [TN] surface finish for "bare" copper > > > Anybody hear of "Benzotriazole"? > > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Wayne Thayer > Sent: Friday, August 15, 2014 2:03 PM > To: [log in to unmask] > Subject: Re: [TN] surface finish for "bare" copper > > Most RF antenna guys get a little too crazy about this. Up to about > 10GHz I see a lot of ENIG used without complaint. If you want to > see someone freak out, go ahead and put a conformal coat on the > traces! > > The original fabricator talking about bare copper may have been > referring to a chromate anti-tarnish, which is often on the FR4 > panels as delivered to the fab. That will hold up for quite a while > also, but I don't know if it can be applied post-fabrication. > > Nickel has poor RF performance. Ag oxidizes and will eventually > look ugly, but the performance will probably be good for a long > time, particularly with some anti-tarnish applied. Direct Au over > copper might be something to consider. > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Yuan-chia Joyce > Koo > Sent: Friday, August 15, 2014 2:43 PM > To: [log in to unmask] > Subject: Re: [TN] surface finish for "bare" copper > > (1) you need radar guy (2) my guess would be Ag. > just a guess. > jk > On Aug 15, 2014, at 2:37 PM, Larson, Mark wrote: > >> Thank you but I guess I should have been more clear, there are no >> components and no holes on this board, it is an antenna board, I'm >> pretty sure, a couple decades ago perhaps, I had a similar situation >> and I ordered bare copper because that's what the engineer said, I >> got >> a call from the fabricator asking, no, make that telling me, we >> really >> didn't want that. Maybe finish isn't the right word, treatment >> perhaps, he said the copper could be treated with something that >> would >> prevent oxidizing. I think it was part of their normal process before >> applying HASL, but maybe with lead free it is no longer used. >> >> Maybe I could ask the question, what would you apply to prevent >> oxidation yet not affect the performance of the antenna in the >> several >> GigaHertz range.? >> >> -----Original Message----- >> From: TechNet [mailto:[log in to unmask]] On Behalf Of Yuan-chia Joyce >> Koo >> Sent: Friday, August 15, 2014 1:04 PM >> To: [log in to unmask] >> Subject: Re: [TN] surface finish for "bare" copper >> >> agree with steve 100%. It also depend upon your assembly condition: >> flux activity, number of reflow, reflow profile, subsequent exposure >> to environment.... your design group should pick and choose the right >> finishing... not on the MFG floor... my 2 cents. >> jk >> On Aug 15, 2014, at 1:55 PM, Stephen Gregory wrote: >> >>> To add to Wayne's input, make sure you call out the right OSP >>> depending on the board technology...not all OSP's are the same. >>> >>> Steve >>> >>> Sent from my BlackBerry 10 smartphone. >>> Original Message >>> From: Wayne Thayer >>> Sent: Friday, August 15, 2014 11:28 AM >>> To: [log in to unmask] >>> Reply To: TechNet E-Mail Forum >>> Subject: Re: [TN] surface finish for "bare" copper >>> >>> OSP >>> >>> -----Original Message----- >>> From: TechNet [mailto:[log in to unmask]] On Behalf Of Mark Larson >>> Sent: Friday, August 15, 2014 1:12 PM >>> To: [log in to unmask] >>> Subject: [TN] surface finish for "bare" copper >>> >>> Hi, >>> >>> I've got a board that needs bare copper, many years ago I had >>> this as >>> well and seem to recall that they can put on some kind of finish in >>> the process that does not leave it bare, but does protect it in the >>> processing of the board, and consequently does offer some protection >>> to the end user. >>> Anybody know what >>> that is or how I call it out? >>> >>> -- >>> >>> >>> This email and any attachments are only for use by the intended >>> recipient(s) and may contain legally privileged, confidential, >>> proprietary or otherwise private information. 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