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<DIV>David Skolnik wrote: "Of course, I could be wrong"</DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>Whereas anything is possible, I suspect =
you are
pretty much right on with your post. I've gone through OSHA health =
&
safety training for hazardous material handling and for closed space =
entry and
everything I was taught is consistent with what you've written. =
Especially
germane is what you wrote about the respirators.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Excellent post. Thanks.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Terry Farrell</FONT></DIV>
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<BLOCKQUOTE class=cite cite="" type="cite">From: David Skolnik
<davidskolnik@optonline.net<BR><BR>As explained to me by two =
technical
people from Loctite, which manufactures a wide variety of CA and =
other
adhesives, their Odorless formulation (408 Prism brand Instant =
Adhesive)
accomplishes its odorlessness through a fornulation that has a =
heavier
molecular weight than the odor-ful versions. This weight keeps =
any
fumes from rising to nose level. This is measured as Vapor
Pressure. The exposure limit for this formulation is set at =
the same
level as the regular product, which is 0.2ppm TWA. The =
odor is
perceptible at 1-2ppm and irritation occurs at 3-4ppm. Which =
means, if
you can smell it, you're already over the threshold limit. We
discussed the difference between allergic response and irritant =
response,
the later being the issue in most cases. Allergic response is =
found
more in skin contact than respiration.<BR><BR>While the MSDS advises =
use of
approved respirator, the document's author indicated that such =
dependance is
strongly discouraged for a number of reasons. OSHA regulations =
require
that:<BR><BR>- Any respirator, apart from its appropriateness, must =
be
properly fitted, (sorry, no beards allowed :()<BR>- Worker must pass =
physical to confirm ability to tolerate respiratory strain =
associated with
pulling air through filter device<BR>- Ambient atmospheric moisture =
will
cause fumes to polymerize on the mask's surface, rapidly restricting =
the
available air flow<BR><BR>Bottom line...respirators are not a =
desirable
solution to CA fumes.<BR><BR>Only truly advisable method is to =
generate air
exchange. Simple air circulation, as with a fan is NOT =
advised, since
it will distribute the fumes, though, if the space is large enough, =
and the
elapsed time is not prolonged, a fan might work to displace the =
fumes from
the immediate area of deployment.<BR><BR>As to the post from Dorothy =
Bell, I
can't address the chemistry, per se, however, the issue of =
respiratory
irritation and the ensuing reactions seems to present itself at =
lower dosage
than would be required to cause any symptoms of cyanide =
poisoning. The
MSDS indicates a concern for the material as an irritant, not as a
toxin.<BR><BR>Bottom bottom line - Fumeless is better, fresh air is
best.<BR><BR>Last bottom line - MSDS for Accelerator indicates =
central
nervous system irritant. The residue left after solvent =
dissolves is,
in a word, nasty. I've been way to cavalier in my use of this
stuff.<BR><BR>David Skolnik<BR>Of course, I could be
wrong</BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>