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June 1999

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Subject:
Specifying copper thickness
From:
"<Charles Barker>" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 25 Jun 1999 09:58:08 -0500
Content-Type:
text/plain
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text/plain (9 lines) 
I have a question for all you TechNetters:

If one ounce of copper is .00135" thick (per ANSI/IPC-MF-150F Metal Foil
for Printed Wiring Board), why do the tables in IPC-6012, such as Table
3-9, say: "For each succeeding ounce of copper foil, increase minimum
conductor thickness by 30.0 um (0.0012 inch). My detailitis infected brain
gets hung up on things that don't compute, and this doesn't seem to
compute!

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