So if I'm understanding this correctly, rigid polystyrene or Styrofoam is preferred not because of the material it is made from but because Styrofoam is mostly AIR. The more air you have the closer your test setup will resemble "free-space". Any solid material, no matter what it is made from will not be as good as air. So the goal in a test table is to find a non-conductive material what is strong enough to hold your product with as little mass as possible and as much air.
Styrofoam tends to have static electricity. Does this cause anyone problems during testing? Thanks, The Other Brian From: [email protected] [mailto:[email protected]] On Behalf Of Tarver, Peter Sent: Thursday, January 24, 2008 1:26 PM To: [email protected] Subject: RE: Table for Measuring Emission for Desktop Equipment > From: Brian Kunde > Sent: Thursday, January 24, 2008 7:06 AM > > 4. The standard mentions "glass reinforced plastic" which I assume is > fiberglass. This might also be glass-reinforced polyester molding compound (fiber glass, as I understand it, use epoxy resin). 'Glastic' is one brand of this material. It's the same material as that used for 'cherries' used to mount/isolate bus bar bus bar and the like. It's available in shapes, like angle and U-channel, and probably sheets, if you look hard enough. This material is rigid, fairly dense and can support a good amount of weight (it's used to restrict bus bar in switch gear under fault conditions; it's pretty tough). "Polyester molding compound" is a rather generic material type. Differing formulations may have different dielectric properties, as does polyethylene. Regards, Peter L. Tarver, PE [email protected] CONFIDENTIALITY This e-mail message and any attachments thereto, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this e-mail message, you are hereby notified that any dissemination, distribution or copying of this e-mail message, and any attachments thereto, is strictly prohibited. If you have received this e-mail message in error, please immediately notify the sender and permanently delete the original and any copies of this email and any prints thereof. ABSENT AN EXPRESS STATEMENT TO THE CONTRARY HEREINABOVE, THIS E-MAIL IS NOT INTENDED AS A SUBSTITUTE FOR A WRITING. Notwithstanding the Uniform Electronic Transactions Act or the applicability of any other law of similar substance and effect, absent an express statement to the contrary hereinabove, this e-mail message its contents, and any attachments hereto are not intended to represent an offer or acceptance to enter into a contract and are not otherwise intended to bind the sender, Sanmina-SCI Corporation (or any of its subsidiaries), or any other person or entity. - 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 LECO Corporation Notice: This communication may contain confidential information intended for the named recipient(s) only. If you received this by mistake, please destroy it and notify us of the error. Thank you. - 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
