Facts:
http://www.wd40company.com/files/pdf/msds-wd482671453.pdf
WD-40, regardless of propellent is still very flammable, and that
remains the top of the warning list on the aerosol, as well as the bulk
cans. This MSDS is for the bulk product in a non-aersol container. A
few years ago they changed the propellent to CO2 due to environmental
concerns, not flammability. Like diesel fuel, as well as gasoline, it
only burns when vaporized. When you drop a match into a bucket of
gasoline, the only reason it lights is because of a layer of vapor on
the surface. Gasoline has that vapor on the surface down to lower
ambient temps than Diesel or kerosene. Once that vapor layer is lit, the
heat from that vapor burning heats more of the liquid, turning it into
vapor which then also combusts. Same thing as a candle. The wax itself
wont burn even of you hold a match against it. It needs a wick, to draw
up molten wax and turn it into a vapor mixed with air before it will
support combustion. If you spray WD-40 into a flame, it will go poof
pretty dramatically, because it is atomized as it comes out.
http://www.youtube.com/watch?v=tOfDwOSDLYM
Note that in the second part of this guys demo, he has dispensed so
WD-40 onto a concrete slab. That's why he fails to ignite it. The
concrete absorbs the WD-40 and acts as a giant heat sink, preventing the
formation of combustible vapor. Kero and diesel would also be difficult
to ignite like that.
Bill Bina
On 5/19/2013 10:21 AM, Bill Coleman wrote:
Well Rick, I respect your opinion and believe this to be true. However, I'm
guessing you are like most of us on this list, & also older than dirt. And
from what I can garner, like Joe says, over time WD-40 has had its
propellant changed from propane to carbon dioxide. You can spray it into a
flame and it will put the flame out.
I don't think it works for engine starting anymmore. However, I could be
wrong. I thought I was wrong once, but I was mistaken.
Bill Coleman
C&C 39
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