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Petroleum Jelly Coating for Enhancing Electromagnetic Shielding Reliability of Joints in Electronic Boxes

IP.com Disclosure Number: IPCOM000118294D
Original Publication Date: 1996-Dec-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 23K

Publishing Venue

IBM

Related People

Behnke, JF: AUTHOR [+2]

Abstract

Disclosed is a method for enhancing the electromagnetic shielding reliability of joints between electronic box covers and frames. For joints to retain their shielding ability, the surface resistivity of the faying surfaces on covers and frames should remain low over the life of the product.

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Petroleum Jelly Coating for Enhancing Electromagnetic Shielding Reliability
of Joints in Electronic Boxes

      Disclosed is a method for enhancing the electromagnetic
shielding reliability of joints between electronic box covers and
frames.  For joints to retain their shielding ability, the surface
resistivity of the faying surfaces on covers and frames should remain
low over the life of the product.

      A thin layer of petroleum jelly or a similar petrolatum
compound smeared on the faying metallic surfaces of the frames and
covers was found to help maintain the surface resistance well in the
sub-Ohm range, known to be acceptable for electromagnetic shielding.
Even active  metals such as zinc were protected by this coating and,
thereby, made suitable as electrical bonding and grounding interfaces
for achieving electromagnetic interference and compatibility
requirements.