Many thanks for your good materials related long term safety issue. I also found below materials from Japan. It is quite conclusive to the one from Adam.
http://www.fujitsu.com/jp/group/fql/services/product-quality/analysis/advantage/red-phosphorus/ Note: You may open this web page from Google Chrome and translate it in English. Although it may not be 100% of plastics with red phosphorus causing catch fire, the risk is quite high as per reported cases. Should it fall into safety standard or chemical standard? Thanks and regards, Scott On Wed, 2 Jan 2019 at 08:17, Adam Dixon <lanterna.viri...@gmail.com> wrote: > Here's a good article focused on component reliability with some > discussion of how red phosphorus is produced and comparison to several > alternate fire retardant chemistries: > > > https://www.dfrsolutions.com/red-phosphorus-induced-failures-in-encapsulated-circuits > > > Cheers, > Adam in Atlanta > adam.di...@ieee.org > > > > On Tue, Jan 1, 2019 at 5:46 PM John Woodgate <j...@woodjohn.uk> wrote: > >> Well, there wouldn't be any mention of white phosphorus, of course, >> because that would indicate that the technique is not safe at all. I just >> wonder how they stop it happening; it appears to be just a mechanical >> envelopment by the polyamide (e.g. Nylon). If so, prolonged moderate >> heating over several years might cause migration and subsequent conversion >> to the other allotrope at surfaces. >> >> The BASF document is quite informative: >> *In a report by the German Federal Environment Agency, it is stated that >> the red phosphorus used in polymers can only be released into the >> environment at the plastic interfaces, where it reacts with water to form >> phosphorus oxides and** phosphoric acids.* >> >> Actually, it's a two-step process; first we get oxidation: 4P +3O2 >2P2O3, >> then the trioxide dissolves in water to make 'phosphorous acid' (the quotes >> are because it exists in two forms with different formal chemical names). >> >> I just hope that this isn't another case like CFCs, where a highly >> undesirable effect was not recognized until it became serious. The >> Wikipedia article on allotropes of phosphorus says: >> >> *However, for electronic/electrical systems, red phosphorus flame >> retardant has been effectively banned by major OEMs due to its tendency to >> induce premature failures. There have been two issues over the years: the >> first was red phosphorus in epoxy molding compounds inducing elevated >> leakage current in semiconductor devices[5] and the second was acceleration >> of hydrolysis reactions in PBT insulating material.* >> >> I think that's a wrap! >> >> Best wishes >> John Woodgate OOO-Own Opinions Only >> J M Woodgate and Associates www.woodjohn.uk >> Rayleigh, Essex UK >> >> On 2019-01-01 21:24, Richard Nute wrote: >> >> >> >> If the hype is true, and my interpretation is correct, red phosphorous as >> a flame-retardant additive is much better than bromine-based additives. I >> don’t know of cost differential. (In the two websites I looked at, there >> was no mention of degradation to white phosphorus.) >> >> >> >> BASF: >> https://www.plasticsportal.net/wa/plasticsEU~en_GB/function/conversions:/publish/common/upload/technical_journals/electronics_and_mechatronics/Umwuchtsensor.pdf >> >> >> >> Rinka: >> http://www.rinka.co.jp/english/products/flame-retardant/index.html >> >> >> >> Best wishes for the New Year, >> >> Rich >> >> >> >> >> >> >> >> >> - >> ---------------------------------------------------------------- >> >> This message is from the IEEE Product Safety Engineering Society emc-pstc >> discussion list. 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To post a message to the list, send your e-mail to < >> emc-p...@ieee.org> >> >> 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://www.ieee-pses.org/list.html (including how to >> unsubscribe) <http://www.ieee-pses.org/list.html> >> List rules: http://www.ieee-pses.org/listrules.html >> >> For help, send mail to the list administrators: >> Scott Douglas <sdoug...@ieee.org> >> Mike Cantwell <mcantw...@ieee.org> >> >> For policy questions, send mail to: >> Jim Bacher <j.bac...@ieee.org> >> David Heald <dhe...@gmail.com> >> > - > ---------------------------------------------------------------- > > 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 < > emc-p...@ieee.org> > > 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://www.ieee-pses.org/list.html (including how to > unsubscribe) <http://www.ieee-pses.org/list.html> > List rules: http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > Scott Douglas <sdoug...@ieee.org> > Mike Cantwell <mcantw...@ieee.org> > > For policy questions, send mail to: > Jim Bacher <j.bac...@ieee.org> > David Heald <dhe...@gmail.com> > - ---------------------------------------------------------------- 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 <emc-p...@ieee.org> 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://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
