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March 1997

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Subject:
Re: Microsectioning
From:
[log in to unmask]
Date:
Thu, 27 Mar 1997 15:46:06 -0500 (EST)
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This is a good etchant if you are going to etch 
and evaluate a bar of copper -

IT IS A BAD ETCHANT TO USE FOR PLATED COPPER DEPOSITS

It will "overetch" the small grain sizes of plated copper
and mask cracks and separations.

Again it is a good etchant for formed copper, but 
not the etchant of choice for boards..

IPC test method for microsectioning gives the ammonium hydroxide
hydrogen peroxide etchant and that is the only etchant that is
recognized by the government for all of their test labs.  It is a 
nightmare to try and correlate results if the labs do not use the same
etchant.

Susan Mansilla
Robisan Laboratory

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