Catherine Smith:

One of our customers began experiencing this, and we did some pretty thorough
research, and found it was exactly what Phil thought it was...holes in the
Copper foil, allowing epoxy resin to seep through.

The customer set up incoming inspection on laminate using a black
light...FR-4 glows when hit by black light...and has gotten their vendor to be more
careful of the Copper they use.

We are seeing a lot of Copper foil being imported that is not up to the usual
standards, and it seems to cause this problem more often.

Good luck...

Rudy Sedlak
RD Chemical Company

---------------------------------------------------
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 847-509-9700 ext.5315
-----------------------------------------------------