In message <cabyvtvny1rjvr5g8moofwhm43wpbooszi0yrefkimxx6dvg...@mail.gmail.com>, dated Wed, 15 Aug 2012, Doug Powell <[email protected]> writes:
>For example the UL 94 test is a 30 second exposure to a 50W flame. >Would a 15 second 100W flame be equivalent? Sometimes, sometimes not. It depends on what the heat does to the material. I know of three effects, but there may be more: 1. The material itself oxidizes rapidly with energy release, so may be said to 'burst into flames'. Thin natural textiles may do this (but wool is type 3). 2. The material rapidly decomposes with release of oxygen, so 'instantaneously combusts'. Cellulose nitrate (Celluloid) is an example. 3. The material has to heat up a lot before it begins to decompose and release combustible gases. ABS plastic is an example, so is wood. Clearly, time of exposure matters. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Instead of saying that the government is doing too little, too late or too much, too early, say they've got is exactly right, thus throwing them into total confusion. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ 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]>
