Steve, Interesting. Pressure at 35000 is about 1/3 that of 11000. So I would suspect a lot of bags to pop. And an IC bag is longer and thinner than a potato chip bag. I long thin bag could place tremendous forces on the seams. I was only thinking about leaks. Now you make me think about tearing bags. Aircraft are pressurized to the 8000 ft level. See: http://en.wikipedia.org/wiki/File:Empty_bottle_crushed_by_cabin_pressurizati on.jpg Assume that bottle was a bag with a PCB inside! Still might not be a serious problem, just something I never thought of before. Bob K. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Smith Sent: Monday, October 15, 2012 2:01 PM To: [log in to unmask] Subject: Re: [TN] Air Pressures Changes During Overnight Shipping Once when I was on vacation traveling in Colorado I was about to go into the Eisenhower tunnel on I-70 which is about 11,000 feet in altitude when I heard this sharp bang. I grabbed the steering wheel tight thinking that I had just blown a tire. But after a few seconds I realized that the van was fine. Then one of my sons in the back of the van said "Hey dad, was that bag of Doritos open?". My regards, Steve Smith Project Engineer Staco Energy Products Co. "Your tailored power solutions provider" DISCLAIMER AND/OR CONFIDENTIALITY NOTICE: This message, including any attached materials, is intended solely for the use of the individual or entity to whom it is addressed and may contain information that is privileged, confidential, and exempt from disclosure under applicable law. If the reader of this electronic mail transmission 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 e-mail or call Staco Energy Products Co. at (937) 253-1191. Thank you for your cooperation. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Joyce Koo Sent: Monday, October 15, 2012 1:42 PM To: [log in to unmask] Subject: Re: [TN] Air Pressures Changes During Overnight Shipping If your package as good as a bag of potato chips, no problem. If your package can not withstand cabinet pressure change, something is wrong with your package. We are not talking about rapid decompression as in case of bullet holes. (In that case, you got other more important stuff to worry about than potato chips:-) -------------------------- Sent using BlackBerry ----- Original Message ----- From: Robert Kondner [mailto:[log in to unmask]] Sent: Monday, October 15, 2012 01:30 PM To: [log in to unmask] <[log in to unmask]> Subject: [TN] Air Pressures Changes During Overnight Shipping Hi, I was wondering if anyone knows about changes in air pressure as experienced by overnight shipping of components. High altitude air is fairly dry but a leaking package would re-inflate somewhat on landing sucking in ground level air. This all might amount to a pile of hogwash but I was curious if it had ever been explored. Bob K. ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------------------------- This transmission (including any attachments) may contain confidential information, privileged material (including material protected by the solicitor-client or other applicable privileges), or constitute non-public information. Any use of this information by anyone other than the intended recipient is prohibited. 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