Re: Resin dust hazard?



In the electronics assembly industry (as in printed
circuit board assembly), a laminar flow booth or smoke
extraction system is used to control fumes from the
soldering process. Basically both of these things are
blower systems with the intake close to the workpiece and
the exhaust in a remote location. There is usually a filter
in line before the exhaust to capture most of the
particulates/fumes in the exhaust stream, with the idea of
preventing transferring the problem to a remote location.

I think you could do a poor man's smoke extraction system
with a muffin fan, a furnace filter, and a couple lengths of
flexible dryer vent hose.


Mike Carson

----- Original Message -----
From: "Dave & Libby Nelson" <muskoka@...>
To: <STMFC@...>
Sent: Thursday, 17 January, 2002 01:21
Subject: RE: [STMFC] Resin dust hazard?

: > -----Original Message-----
: > From: Jeff Aley - GCD PE [mailto:jaley@...]
: > I assume that you are already familiar with
Manufacturer's Safety
: > Data Sheets (MSDS). If not, my (feeble) understanding
is that all
: > manufacturers of chemicals are required to publish an
MSDS that describes
: > the hazards and toxicities of their products.
: >
: > It may be worth your while to contact the ACC
manufacturer and
: > request an MSDS; you may also be able to obtain the
proper MSDS from the
: > resin kit manufacturers. If they are reluctant to
reveal exactly which
: > resin they are using, then perhaps they can obtain the
MSDS for you.
: I'm becomming familiar with this information. I have a
good idea of exactly
: what is in the resin -- the short name is isocyanates and
there is a whole
: family of compounds (CAS 101-68-8:
4,4'-Methylenediphenyldiisocyanate is
: typical) the choice and mix of which determine whether the
resulting resin is
: a foam, or hard, or soft and flexible, etc. What is
befuddling tho is
: everything I find about sensitivities involve either the
original liquid
: (a.k.a. part A in the resinators inventory) or the
accidental release of
: isocyanates from cured resin via application of heat.
I've seen dangerous
: temperature ranges cited are from a low of 150F to a high
of around 400F. All
: MSDS sheets comment that it's a really bad idea to have
this stuff around food
: (n.b., it appears the standard kit flatening
recommendation of 150F in the
: oven is an extremely bad idea). But again, that's the
original compound.
: It's supposed to be chemically inert when parts A and B
are cured into the
: hardened resin, released again only when heated or burned.
: As I have never done casting, nor heated kit parts, I'm
wondering if it may
: have been the inadvertant ingestion of dust particles from
sanding (I normally
: work with parts very close to my face as I wear a 7x
optivisor). I'm hoping I
: can control the environment well enough to allow me to
continue building resin
: kits.
: Dave Nelson
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