According to the site: http://www.emsdiasum.com/ems/clean/duster.html The stuff I'm using claims "100% ozone-safe pressurized duster products". Since I turn the cans upside down (or refill my quick-freeze cans for a more convenient spraying position), am I being more gentle to the environment? If so, we can get down to the real question of "am I wrecking my electronics systems by using quick-freeze for troubleshooting?" Carl Van Wormer Cipher Systems 1815 NW 169th Place, Suite 5010 Beaverton, OR 97006 Phone (503)-617-7447 Fax (503)-617-6550 -----Original Message----- From: Brian Ellis [mailto:[log in to unmask]] Sent: Friday, April 26, 2002 2:52 AM To: [log in to unmask] Subject: Re: [TN] Freeze Spray Trouble Shooting Bev I agree PFCs are the worst climate changers (with SF6) that exist. Some of them are over 10,000 times worse than CO2. As a rule of thumb, 6 freezing cans which contain a PFC gas would have as much effect on climate change as a medium car over its whole lifetime (horrific thought). Furthermore, there will still be the contents of two of those cans in the atmosphere 40-odd generations from now (assuming man lives for another 40 generations!). However, I think most freezing cans contain HFC-134a, which is bad enough but not as bad as PFCs. Some may still contain HCFC-22 which is just as bad AND an ozone depleter, to boot, but is not phased out under the Montreal Protocol until 2010 (some countries may phase it out sooner). Brian --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL 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/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------