Copper is not a final finish. Solder, gold, soldermask.. Are final
finishes.

Mahendra 

-----Original Message-----
From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of Franklin
Asbell
Sent: Monday, February 04, 2008 1:52 PM
To: [log in to unmask]
Subject: Re: [IPC-600-6012] Bare Copper as a Surface Finish

I've always interpreted that to mean bare copper prior to final finish,
are we sure that was not the intention, as these criteria are covered
elsewhere, perhaps we should remove this or state these are requirements
prior to final finish???

As for delivering product with bare unprotected copper finish, I would
think these would only occur in rare instances under quite unique
conditions, in those instances the persons processing the boards with
bare unprotected copper most likely have a process that may not need to
be addressed any further within 6012.

Just my thoughts.

Franklin

-----Original Message-----
From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of John Perry
Sent: Monday, February 04, 2008 2:53 PM
To: [log in to unmask]
Subject: [IPC-600-6012] Bare Copper as a Surface Finish

Colleagues,

 

Our IPC-6012B specification provides for bare copper as a final finish
in Table 3-2, Final Finish, Surface Plating and Coating Thickness
Requirements.

 

The task group is evaluating whether or not this should be removed from
Table 3-2 in the future IPC-6012 Revision C.  Among the concerns with
bare copper are instances of single-sided via protection that provides
for entrapment of chemistries that attack the bare copper in the hole
wall.

 

If there are those of you out there who use bare copper as a surface
finish, could you provide feedback to IPC as to how it is used in your
applications?

 

Thanks in advance,

 

John Perry

Technical Project Manager

IPC

3000 Lakeside Drive # 309S

Bannockburn, IL 60015

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1-847-597-2818 (P)

1-847-615-7105 (F)

1-847-615-7100 (Main)