Ted 

You will note that in IPC-6012 that the copper purity, tensile strenght,
elongation has been moved to the Special Requirements-(when specified)
section in Table 4-3.  If you specify, it is hoped that you put in you own
numbers.  The 6% was based on pyro copper and the 36 KSI was based on acid
copper.  Neither probably have any relevency to good/bad boards.  The pyro
should have a KSI of about 55 KSI and the acid copper should have a a 15%
elongation as a miimum.  The task group moved the requirement to the special
requirements because it is a internal process control requirement and should
not be used as a conformance requirement.  Additionally, since ithe test
requires a surface plating of 2 mils, it is probably not very representative
of the hole plating at 1 mil.  I encourage users to apply their own numbers
if they want to specify it, and I encourage suppliers to set up there own
standards to be used as a an internal process control on their copper bath as
we do with Hull Cell, CVS, grain size, Knoop hardness, TOC, copper content,
acid content etc.  This test belongs in the process control area and not a
conformance requirement.

Phil Hinton   

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