Phil:  You are probably on the right track looking at the oxide.

Since the assembly people are so fixed on the appearance of the oxide...(sigh), the fabricators may re-run panels down the oxide line if they come out initially looking "weird"...
Each time they are run down the modern "alternate" oxide line, they lose about 2 microns (80 microinches) of Copper.  Would this cause the problem you are seeing?

Rudy Sedlak
RD Chemical Company

DUTTON Phil <[log in to unmask]> wrote:
Hello Technetters,

We have a multilayer board that is exhibiting higher than expected
resistance on an internal layer track.
The track is 0.006" and about 1.5 inches long, yet has a resistance of
approximately 1 ohm. From what we can tell, the track has not been over
etched.
I'm wondering if anyone can shed some light on what could be the cause
of this.
I'm thinking that the layer may have had an excessive 'black oxide'
treatment to promote adhesion. Is this possible?

thanks,

Phil Dutton C.I.D.

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------

__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
http://mail.yahoo.com