Chris,

FTIR may work.  Comparing the unknown to a known spectra of the resist, 
polyimide and acrylic should identify the debris.

Lamar



From:   Chris Mahanna <[log in to unmask]>
To:     [log in to unmask]
Date:   08/18/2010 12:16 PM
Subject:        [TN] resist or adhesive?
Sent by:        TechNet <[log in to unmask]>



I have a customer who is asking me to come up with a test-

To prove with a high degree of certainty whether debris that is 
encapsulated in a hole-wall plating nodule (which is now ground/polished 
open in a section) is resist, polyimide flex, or acrylic coverlay 
adhesive.

I said: "well it is translucent, and it isn't blue".  IMO it is almost 
certainly the acrylic adhesive.

Could I put the mount in a bath of resist strip and see if the inclusions 
dissolve?

Chris Mahanna
Robisan Lab

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