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Evaluation of Drilled Holes in Circuit Boards

IP.com Disclosure Number: IPCOM000043208D
Original Publication Date: 1984-Jul-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Prusik, EW: AUTHOR

Abstract

This method of evaluating drilled holes in circuit boards permits the detection of drill smear, hole fractures and cracks by increasing the visibility of these defects. The board samples to be evaluated are encapsulated in epoxy, lapped, polished and sectioned into the length of the hole. To delineate the defects or drill smear, the polished surface is exposed to acetone approximately 0.5 to 2.5 minutes, depending on the board material. The acetone application highlights the fractures and cracks in the holes as well as epoxy smears.

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Evaluation of Drilled Holes in Circuit Boards

This method of evaluating drilled holes in circuit boards permits the detection of drill smear, hole fractures and cracks by increasing the visibility of these defects. The board samples to be evaluated are encapsulated in epoxy, lapped, polished and sectioned into the length of the hole. To delineate the defects or drill smear, the polished surface is exposed to acetone approximately 0.5 to 2.5 minutes, depending on the board material. The acetone application highlights the fractures and cracks in the holes as well as epoxy smears.

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