Ed, It is common practice among automotive enthusiasts (car nuts) to place sheets of cardboard underneath cars stored for a long time in garages to absorb moisture vapors coming up through concrete floors. The cardboard is replaced periodically with fresh sheets.
Scott Lacey On 25 Jan 2008 at 15:22, Price, Edward wrote: > > I don't have any data on cardboard, but it seems to me that the > cardboard should be just about the same humidity as the air > next to it. The cardboard box material is relatively thin, and > permeable to the air. Is there something I don't understand > about the cardboard; will it somehow extract or concentrate > moisture from the surrounding air? > > Ed Price > [email protected] WB6WSN > NARTE Certified EMC Engineer & Technician > Electromagnetic Compatibility Lab > Cubic Defense Applications > San Diego, CAUSA > 858-505-2780 (Voice) > 858-505-1583 (FAX) > Military & Avionics EMC Is Our Specialty > > > > From: [email protected] [mailto:[email protected]] On Behalf Of Daniel Roman > Sent: Thursday, January 24, 2008 6:05 AM > To: [email protected] > Subject: RE: Table for Measuring Emission for Desktop Equipment > If you can't use wood for a table, why would cardboard be ok? I would imagine that it would > alsoabsorb moisture from the air and cause attenuation at high frequencies. > > Regards, > > -- > Dan Roman, N.C.E. > Regulatory Engineer > Dialogic, Inc. > 1515 State Rt. 10 > Parsippany, NJ 07054-4538 > *mailto:[email protected] > (Voice: +1 973-967-6485 Fax: +1 973-967-6262 > Internet: http://www.dialogic.com > > > > From: [email protected] [mailto:[email protected]] On Behalf Of Price, Ed > Sent: Thursday, January 24, 2008 8:53 AM > To: [email protected] > Cc: [email protected] > Subject: RE: Table for Measuring Emission for Desktop Equipment > I am fortunate to have our company's shipping department > located immediately next to my lab. I often use empty cardboard > boxes to build non-conducting platforms. It's surprising how > much weight a taped box can support. > > There are several densities of urethane foam, but there is also a > white foam made from polyethylene (or maybe polystyrene). This > stuff is so strong that you can't hardly make a dent in it with > your thumb. Finally, there is the foam which is used for foam-in- > place packing. This stuff is poured into a box like a bubble-bath, > and then cures to a hard foam. Fill an empty cardboard box with > this foam, and you can get a very tough support structure. > > > - ---------------------------------------------------------------- This message is from the IEEE Product Safety > Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ > To post a message to the list, send your e-mail to [email protected] > Instructions: http://listserv.ieee.org/request/user-guide.html > List rules: http://www.ieee-pses.org/listrules.html > For help, send mail to the list administrators: > Scott Douglas [email protected] Mike Cantwell [email protected] > For policy questions, send mail to: > Jim Bacher: [email protected] David Heald: [email protected] > All emc-pstc postings are archived and searchable on the web at: > http://www.ieeecommunities.org/emc-pstc - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
