reverse engineering

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Article #251

#251

From: Don Smith
Date: Fri, 01 Jun 1990 23:22

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I would like to reverse engineer a calculator watch but am having
a hard time removing the epoxy coating the chip.  So far I have 
tried a number of chemicals including: 

   acetone
   and hydrochloric acid.

The hydochloric acid removed the epoxy but also damaged the chip. It
appears that the epoxy is a cross linked polymer structure which is
hard to break apart. I would appreciate the names of chemicals which
can break up cross linked polymers without damaging the chip.  The
watch is an inexpensive OEM type watch costing about $10.

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arc1-ca.pugleaf.net!utzoo!attcan!uunet!seismo!ukma!rex!uflorida!haven!decuac!decwrl!elroy.jpl.nasa.gov!sdd.hp.com!zaphod.mps.ohio-state.edu!van-bc!ubc-cs!fornax!donaldo

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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!seismo!ukma!rex!uflorida!haven!decuac!decwrl!elroy.jpl.nasa.gov!sdd.hp.com!zaphod.mps.ohio-state.edu!van-bc!ubc-cs!fornax!donaldo
From: donaldo@fornax.UUCP (Don Smith)
Newsgroups: comp.lsi,sci.electronics
Subject: reverse engineering
Keywords: epoxy removal
Message-ID: <778@fornax.UUCP>
Date: 1 Jun 90 23:22:23 GMT
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