My understanding of the low temp moisture extraction process is that it's carried out under partial vacuum, not high vacuum, so that the moisture neither boils off rapidly, nor freezes - either of which would cause delamination if it were allowed to happen. My initial skepticism about the process was relieved after I spoke to Altos Engineering further about it, although I would want to see the process obtain industry approval or conduct my own tests with it before I considered adopting it as a process here. Even if it were an approved process, the equipment is too expensive to justify having for my little project. Peter "Zweigart, Siegmund" <[log in to unmask]> 12/12/2002 03:43 PM Sent by: TechNet <[log in to unmask]> Please respond to "TechNet E-Mail Forum."; Please respond to "Zweigart, Siegmund" To: [log in to unmask] cc: (bcc: DUNCAN Peter/Asst Prin Engr/ST Aero/ST Group) Subject: Re: [TN] Vacuum Just one comment If you buy frozen dried food like coffee its is dried under vacuum, because the anomaly of Water. So if the Vacuum is high (or low) enough water will freeze because freezing means a volume expansion and this is easier in vacuum. If you want the get in trouble with high vacuum specialist put one drop of water in their chambers - have fun. One problem with drying under vacuum is also that the transport of moisture away from the component is only possible by diffusion not by convection. Siggi --------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e 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/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e 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/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------