Carey,

I'd like to hear more about your sample preparation technique. What are the
advantages/disadvantages of encapsulating your samples in wax as opposed to
the standard epoxy or acrylic resins? Also, what purpose does the polishing
tripod serve?

Thanks,
David
                -----Original Message-----
                From:   Carey Pico [mailto:[log in to unmask]]
                Sent:   Wednesday, December 08, 1999 9:57 PM
                To:     [log in to unmask]
                Subject:        Re: [TN] microsectioning equipment for
microvias

                Edward
                Nice to hear from you again.  If the standard sectioning
equipment is not satisfactory, I have developed a wax-mounted technique.
Using a wax called Crystal Bond (it is a transparent wax with a good
hardness), I mound a piece of board with the vias on a cross-section mount.
Using a high accuracy polishing tripod, use 600 grit sand paper and inspect
periodically using a microscope.  When you get close, use a higher quality
sandpaper (e.g., 1,000 or whatever it is, I can't remember).   It takes
about 20 minutes per sample.  It is labor intensive, but it works nearly
100% when you are in practice.  I found the parts at South Bay Technology in
Anaheim, CA.  It is a microscopy supply shop.
                Carey

##############################################################
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
##############################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in
the body:
To subscribe:   SUBSCRIBE TECHNET <your full name>
To unsubscribe:   SIGNOFF TECHNET
##############################################################
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information.
If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or
847-509-9700 ext.5365
##############################################################