Date: Fri, 3 Nov 2006 08:09:39 -0500
Reply-To: "Lazarski, Peter M." <Peter.Lazarski**At_Symbol_Here**US.NGRID.COM>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: "Lazarski, Peter M." <Peter.Lazarski**At_Symbol_Here**US.NGRID.COM>
Subject: Re: flammable solvents in clean room
In-Reply-To: A

I believe you could have a potential problem with evaporated solvents reaching a lower explosive limit in that space. Ethyl acetate 2.2% LEL Ethanol 3.3% LEL Hexane 1.2% LEL As a precaution, you should monitor for this. The information contained in this e-mail message and any attachments may be confidential. It is intended only for the use of the individual or entities named above. If the reader of this message is not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail at the originating address. Peter Lazarski National Grid USA Lab. & Testing Svcs., Bldg. 1 7437 Henry Clay Blvd. Liverpool, NY 13088 (315)460-2114 -----Original Message----- From: DCHAS-L Discussion List [mailto:DCHAS-L**At_Symbol_Here**LIST.UVM.EDU] On Behalf Of nagyd**At_Symbol_Here**MSNOTES.WUSTL.EDU Sent: Thursday, November 02, 2006 4:22 PM To: DCHAS-L**At_Symbol_Here**LIST.UVM.EDU Subject: [DCHAS-L] flammable solvents in clean room Looking for some help on limited use of flammable solvents in a class 10,000 clean room. The proposal is to use hexane, ethyl acetate, and ethanol (absolute) for an extraction and purification project that would last approx. 1 week, would involve approx 30 L total of the 3 solvents and here's the catch....there's no fume hood in the clean room. The process would involve mixing in 4-8L poly bottles, filtering using house vac, cleaning with ethanol and oven drying the cleaned glassware, distillation of hexane/ethyl acetate mixture, then do another extraction with ethanol, distill the ethanol, finally drying the flask with its solid contents in a vac oven (house vac). All this to be done at bench top in a positive-pressurized clean room. I have suggested the use of a ductless fume hood provided that the charcoal filter can adequately handle the 3 solvents. Obviously, everything has to be kept closed at all times except when adding or removing. But I would welcome other thoughts, suggestions, and experiences. Dennis Dennis R. Nagy, CHMM Washington University EHS/OSH Campus Box 8229 St. Louis, MO 63110 (314) 747-3172 (314) 362-1995 (fax) nagy**At_Symbol_Here** **** For your information: the Rhode Island Operations of New England Gas Company have been acquired by National Grid and are now doing business under that name. **** This e-mail and any files transmitted with it, are confidential to National Grid and are intended solely for the use of the individual or entity to whom they are addressed. If you have received this e-mail in error, please reply to this message and let the sender know.

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