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 > *************************************************************************** PaddleWise Paddling Mailing List Submissions: paddlewise_at_lists.intelenet.net Subscriptions: paddlewise-request_at_lists.intelenet.net Website: http://www.gasp-seakayak.net/paddlewise/ ***************************************************************************
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