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August 2010

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Subject:
From:
Karen Tellefsen <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Karen Tellefsen <[log in to unmask]>
Date:
Wed, 18 Aug 2010 13:46:18 -0400
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It might if there is enough crud in the nodule to get a decent spectra. 
Really good spectroscopists with multiple reflection ATR's or microscope 
attachments have tricks for getting good spectra from very small samples, 
but with an older FTIR and salt plates this isn't so easy.  :(

Karen Tellefsen - Electrical Testing
[log in to unmask]
908-791-3069




From:   Lamar Young <[log in to unmask]>
To:     [log in to unmask]
Date:   08/18/2010 12:53 PM
Subject:        Re: [TN] resist or adhesive?
Sent by:        TechNet <[log in to unmask]>



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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