We found a cool solution to our problem. I agree with all the previous comments especially those of Rex and Mike regarding the stringent requirements with self contained or supplied air breathing apparatus or is that apparati? Our solution was a Backpack Kit from Grainger that attaches to a half mask, http://www.grainger.com/Grainger/wwg/productIndex.shtml?operator=keywordSear ch&search_type=keyword&QueryString=bp-1002&submit.x=13&submit.y=8. It has two hoses that go down the operators back and has a canister attached to the end of each hose. Since he's working under a hood the fresh air is pulled in from behind him and he never gets the canisters near the alcohol. It was a simple solution to a big problem. Thanks for all the input, KennyB Ext 43-----Original Message----- From: [log in to unmask] [mailto:[log in to unmask]] Sent: Wednesday, June 18, 2008 11:04 AM To: [log in to unmask] Subject: Re: [TN] respirator cartridge for IPA Please be cautious with this airline respirator?approach as well. There must be an in-line CO detector to safely use "wall plug" compressed air. An affordable alternative might be a Survivair-type inexpensive supplied air unit. In all cases, though, the flammability must also be considered and may require ventilation. Mike Moninger Thermospray Company, Inc. Date: Tue, 17 Jun 2008 16:31:40 +0200 From: Matthias Mansfeld <[log in to unmask]> Subject: Re: Respirator Cartridge for IPA On 17 Jun 2008 at 17:19, Brian Ellis wrote: > If the activated carbon filters on the masks are saturated, then they > are worse than useless. If the operators can smell the stuff, then > they must be saturated. A filter is generally quite small, typically > containing 30-40 g of carbon, which may adsorb, say, 5 g or so > solvent. I suggest that you find a scuba diver who will lend you his > tanks! Or, if you have pressurised air in a appropiate quantity and quality available out of the wall plug, you could use masks with supply from that pressurised air. Many work safety manufacturers (like Draeger, Auer-MSA etc.) offer such stuff. Just a special hose for the "wall plug", pressure regulator to wear at a belt, another hose to the mask. Best wishes Matthias --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------