Interesting N-hexane is also the gas they inject into test chambers to see if there is an explosion in the presence of a spark. Mil-810F section 511.4-2 paragraph 2.1 Unless otherwise specific, use n-hexane, either reagent grade or 95% n-hexane with 5% hexane isomers. Given that the test explosion in the chamber was much less impressive than I had hoped for the sheer test excitement value, it must be a very low ignition point, low energy fuel. No wonder my labels never stick on, they are getting blown off in shipping.
Gary -----Original Message----- From: John Woodgate [mailto:[email protected]] Sent: Tuesday, March 26, 2013 1:24 PM To: [email protected] Subject: Re: [PSES] 60950-1 durability test solvent In message <C2866F9FC4CB034EB51A633DF16859860CEA7518@ssbarcelone>, dated Tue, 26 Mar 2013, "Gelfand, David" <[email protected]> writes: >Is there a product I can buy at the hardware store that is roughly >equivalent to the hexane specified in durability test: > >" The petroleum spirit to be used for the test is aliphatic solvent >hexane having a maximum aromatics content of 0,1 % by volume, a >kauributenol value of 29, an initial boiling point of approximately 65 >°C, a dry point of approximately 69 °C and a mass per unit volume of >approximately 0,7 kg/l." It's actually about 20% nonsense. I'll explain. Long years ago, I objected to the bare phrase 'petroleum spirit' in IEC 65 (as it was then, because people were using all sorts of jungle juice, some of which dissolved the moulded enclosures. I suggested defining the reagent as 'n-hexane'. The convener at that time, not being a chemist, asked a company chemist what 'n-hexane' was, and received that complicated text, presumably extracted from a supplier's specification. Later, I raised the issue again, following complaints that reagent to that specification was no longer available except as a 'to order' product, and that text was meant to be replaced by a simpler one, but I see in current (and even future) editions (of IEC/EN 60065, I haven't looked at IEC/EN 60950-1 or 62389-1 in case they are even more disappointing), the text is in the wrong order, or the GOOD information is relegated to a Note: NOTE The designation “n-hexane” is chemical nomenclature for a "normal" or straight chain hydrocarbon. This petroleum spirit may further be identified as a certified ACS (American Chemical Society) reagent grade hexane 1042 (CAS# 110-54-3). You should be able to buy that quite easily. -- OOO - Own Opinions Only. See www.jmwa.demon.co.uk SHOCK HORROR! Dinosaur-like DNA found in chicken and turkey meals 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]> - ---------------------------------------------------------------- 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]>
