(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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