Re: [Texascavers] polypropylene

[Rod Goke]

"I once had polypropylene prusik slings." ... "A major problem with polypropylene is its low melting point, 130 to 170 degrees C. You could easily get your brakebars hot enough to melt, or at least seriously degrade, polypropylene." Bill, most of the cavers I knew who used polypropylene prusiks avoided this problem by attaching their brakebars to metal racks (or to metal carabiners in the early days) instead of attaching them to polypropylene prusik slings. That tended to make rappelling easier, too. ;-) Rod -----Original Message----- >From: Mixon Bill >Sent: Jun 3, 2011 9:44 PM >To: Cavers Texas >Subject: [Texascavers] polypropylene > >I once had polypropylene prusik slings. They worked fine, although I >used them only once in a real pit (~100 ft), just to show that I >could. About that time, Jumars came out, and I could afford the $18 to >get a pair. > >A major problem with polypropylene is its low melting point, 130 to >170 degrees C. You could easily get your brakebars hot enough to melt, >or at least seriously degrade, polypropylene. There may once have been >a fatal accident at Gaping Gill (340 feet) in England for that reason. >The nylon used in caving ropes melts at 265C. -- Mixon >---------------------------------------- >No dolphins were killed in the preparation of this e-mail. >---------------------------------------- >You may "reply" to the address this message >came from, but for long-term use, save: >Personal: bmi...@alumni.uchicago.edu >AMCS: edi...@amcs-pubs.org or sa...@amcs-pubs.org > > >--------------------------------------------------------------------- >Visit our website: http://texascavers.com >To unsubscribe, e-mail: texascavers-unsubscr...@texascavers.com >For additional commands, e-mail: texascavers-h...@texascavers.com > --------------------------------------------------------------------- Visit our website: http://texascavers.com To unsubscribe, e-mail: texascavers-unsubscr...@texascavers.com For additional commands, e-mail: texascavers-h...@texascavers.com