Jack,
In IPC-2221-A on page 17 (section 4) there is a table that has the
Electric Strength of the different types of dielectric materials that
you might be help you determine the cause of your problem. The other
thing to keep in mind is that the Electric strength isn't linear over
thickness. So that might be another source of your problem. 

Hope I was some help, 
Josh Culpepper CID+
Engineer 1
Clean Earth Technologies, LLC
13378 Lakefront Drive
Earth City, MO 63045
314-222-4640 ext. 126


-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Jack
Olson
Sent: Wednesday, November 14, 2007 2:41 PM
To: [log in to unmask]
Subject: [DC] How to Read a Slash Sheet

Can someone please help me interpret slash sheets of IPC-4101?

We are having some board problems, so I went to look up the voltage
breakdown (line 5 in the laminate section)
It lists 40kV for laminates over .5mm, thick, but nothing is listed in
the
column for laminates less than .5mm
(Our design has .1mm laminate)

What does that 40kV mean, and why is it only given for thicker
laminates?

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