Hi Mary! Guy will correct me if I'm wrong, but how MSD's can be damaged by vacuum is that the boiling point of water drops as pressure decreases. So if there is absorbed moisture in the device, and if you drop the pressure quickly enough the water will boil. In fact, you can actually get a liquid to boil at room temperature if you have a vacuum. If you want to see this for yourself, here's an experiment you can try: get a syringe (you don't need a needle). Suck a bit of water into the syringe. Now cover the hole on the syringe with your finger (or a plastic cap if you have one) and pull back on the plunger as hard and as fast as you can. This will create a partial vacuum inside the syringe, and with some luck you should be able to see the water in it boiling. -Steve Gregory- > Guy, > I am gathering information of the rules and regulations of MSD (Moisture > Sensitive Devices). I am in the process of developing a training class for > MSDs. Please explain how vacuum would damage the device. Are you talking of > a physical aspect of damage, esd damage, etc.? Apparently, I need to learn > more about these before I teach the class. Thanks. > Mary Jane Chism > Technical Trainer > Kimball Electronics Group > -----Original Message----- > From: Guy Ramsey [<A HREF="mailto:[log in to unmask]">mailto:[log in to unmask]</A>] > Sent: Friday, December 06, 2002 1:39 PM > To: [log in to unmask] > Subject: Re: [TN] Vacuum > > Yes. > Moisture sensitive components can be damaged by vacuum. > > -----Original Message----- > > From: TechNet [<A HREF="mailto:[log in to unmask]">mailto:[log in to unmask]</A>] On Behalf Of Stolar, Paul W > > Sent: Friday, December 06, 2002 11:33 AM > > To: [log in to unmask] > > Subject: [TN] Vacuum > > > > > > Has anyone ever heard of vacuum damaging components? > > --------------------------------------------------- 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 -----------------------------------------------------