On Mon, 21 Nov 2011 03:33:20 +0000 (UTC), gregz
wrote:

Jeff Liebermann wrote:
Homebrew cleaners and protectors:
http://www.pitt.edu/~szekeres/cleaner.htm
The comments on the effects of silicones plus salt in WD40 are
interesting.

Yes, some old navy guy contacted me and I stuck it in there. Have not
updated anything for a while.

Greg szekeres

Oh, those are your pages. Nice info and thanks.

The silicone and salt atmosphere problem is real. It forms sodium
silicate, which is water soluable. Add almost any acid, and you get
silicic acid. Heat and dry that you get silica gel, which is quite
hard and not very soluable in anything. It takes a while, but it does
happen.

I used to work for a marine radio manufactory in the 1970's. Customers
would sometimes use various lubricants loaded with silicone to clean
pots and switches. It would work, but about a year later, we would
get the radios back with seriously intermittent pots and switches. No
amount of solvent cleaning would fix them, so we just replaced them.
We just assumed they were internally corroded or salt encrusted. I
didn't discover the silicone and salt atmosphere problem until many
years later (when I repeated the mistake on a consulting project).

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558