RE: [Paddlewise] The Epoxy Experience

Thanks Dave, this must be my day, two Dana was right's in one post.  Its
highly unusual to see such things in my email.

As a broad statement of principle Kern Hendricks is right to be concerned
about the possible toxic effects of ketamines and the unknow reaction
products of the vinegar/epoxy mixture.  Good industrial hygiene practice (my
profession), is to keep all chemical exposures to a minimum and to be extra
cautious with unknowns.

If anyone is interested in my rational for the super cartridge or the
nitrile glove recommendation, I will be glad to discuss it off line.

Dana Dickson
> -----Original Message-----
> From: Dave Kruger [mailto:dkruger_at_pacifier.com]
> Sent: Wednesday, June 02, 1999 12:39 AM
> To: Dickson, Dana A.
> Cc: 'PaddleWise_at_lists.intelenet.net'
> Subject: Re: [Paddlewise] The Epoxy Experience
> 
> 
> I had an elaborate summary crafted of the pros and cons of 
> using acetone or
> vinegar to clean epoxy residue (cured/uncured) off your skin. 
>  Then Netscape
> puked and I lost it all.
> 
> The bottom line(s):
> 
> Dana was right, and I was wrong:  acetone is not innocuous 
> for cleaning epoxy
> off your skin.  He's right:  it can hasten breakdown of the 
> protective barrier
> skin provides, thereby substantially increasing the chance of 
> sensitization. 
> I had forgotten that.
> 
> Someone else (Phil Daligan?) indicated the West System people 
> (I think) use a
> proprietary version of vinegar for cleanup, but with no 
> mention of use on
> hands.
> 
> Everybody agrees gloves are mandatory to avoid sensitization. 
>  Dana recommends
> nitrile gloves and  "a respirator with super cartridges 
> (organic vapor, amine,
> acid gas, HEPA, + combo)."  The respirator is more than the 
> MSDS Sheets from
> System Three suggest *for casual use* of epoxy (see: 
> http://www.systemthree.com/index.html and select System Three 
> Epoxy and
> (farther down the page) Part B System Three Hardener #1 
> ...)), so I guess each
> of us
> gets to judge that, though if I worked with the stuff 
> regularly I probably
> would go Dana's route.  YMMV.
> 
> Finally, the owner of System Three chimed in with the post 
> below my sig --
> food for thought for the folks who advocate the use of 
> vinegar as cleanup on
> skin, inasmuch as vinegar and epoxy may form compounds not 
> tested for their
> reactivity and/or toxicity, just as acetone and epoxy may (ketamines).
> -- 
> Dave Kruger
> Astoria, OR
> humbled chemist
> --
> >Dave Kruger <dkruger_at_pacifier.com> wrote:
> 
> > >Anybody got **data** (don't need anecdotal stuff) to back 
> up (or refute) the
> > >claim that using acetone to clean up increases epoxy 
> transfer through skin?
> > 
> > I don't have any data on this particular question.  
> However, acetone will
> > readily react with amines forming ketamines.  This is a 
> reversible reaction
> > with water given off in the condensation of the ketone and 
> amine.  The
> > toxicology of ketamines has not been rigorously studied and 
> I'd be more
> > concerned with this than with your original question 
> insofar as health goes. 
> > I'd be more inclined to use solvent alcohol, isopropyl 
> alcohol or something
> > that would not react with amines.
> > 
> > W. Kern Hendricks
> > System Three Resins, Inc.
> > P.O. Box 70436
> > Seattle, WA  98107
> > Orders Only:  800/333-5514
> > Technical Support:  206/782-7976
> > e-mail:  support_at_systemthree.com
> > website: www.systemthree.com
> 
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