I have a hunch that it has something to do with suppressing metal on metal micro arcing.
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I made mention of nano or micro arching and a seemingly smart fellow thought I was watching to much Star Teck. Then I pointed to a reference in the 2003 EE good book. I didn't write the stuff they did.. One of the main reason for chip failure especially in the nano/tech world..
Space is a bad place to have a bad signal.. No cell service.. BAD nano! :-)
Regards