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8a.8 WD-40




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This article is from the Bicycles FAQ, by Mike Iglesias with numerous contributions by others.

8a.8 WD-40

From: rgibbs@his.com (Rich Gibbs)
Date: Wed, 09 Sep 1998 04:03:00 GMT

There have been many opinions posted here on WD-40's composition, but
here is what the Material Safety Data Sheet [MSDS] says (it's from Oct
93, the latest I could find):

50% Stoddard solvent (mineral spirits) [8052-41-3]
25% Liquified petroleum gas (presumably as a propellant)
[68476-85-7]
15+% Mineral Oil (light lubricating oil) [64742-65-0]
10-% Inert ingredients

(The numbers in square brackets '[]' are the CAS numbers for the
ingredients, as listed in the MSDS.)

Mostly, WD-40 is a solvent, with a bit of light oil mixed in. It
doesn't contain wax (except incidentally, since it's not exactly a
reagent-grade product).

Personally, I use it sometimes for small cleaning jobs, but it's not a
particularly good lubricant for anything that I can think of, offhand.



 

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