We use it for surfaces that will require adhesive at a later date.  That
excludes holes.  The feature is so unexpected that we have to identify
it on the drawing especially as a bare copper area.  We don't need
specification support from 6012 to make this happen.

Mike Green
Electronic Packaging Design
LMCO-Sunnyvale
408-743-1635
One Corporation, One Team

-----Original Message-----
From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of John Perry
Sent: Monday, February 04, 2008 12:53 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)