Chris,

That might not work.  Resist tends to harden once it hits the rinses and 
becomes very difficult to break down.  Depending on the resist type the 
lattice usually breaks into chunks rather than dissolve.

Both acrylic and resist will dissolve in MEK.

Does you micro-section show it coming through from an adhesive layer?

Chuck Brummer l 3M Manufacturing Engineer
3m Electronic Solutions Division--Flexible Circuits
8357 Canoga Ave. l Canoga Park, CA 91304-2605
(818) 734-4930
[log in to unmask] l www.3m.com l www.3mFlex.com




From:
Chris Mahanna <[log in to unmask]>
To:
[log in to unmask]
Date:
08/18/2010 09:16 AM
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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