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?
>>>
>>> --
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