A few days I was talk with Efrain Mercado the president of FEALC, about the kevlar.
He share with me this video about How to break nylon dyneema slings. Is not the same, but is interesting to know. http://dmmclimbing.com/knowledge/how-to-break-nylon-dyneema-slings/ Moni Ponce (Mexico) LCC. MÓNICA GRISSEL PONCE GONZÁLEZ Coordinadora de la Comisión Internacional de Técnicas y Materiales de la UIS Instructor Nacional Certificado de Espeleología por la FMAS Directora de MP- Mex Caving Asociación Coahuilense de Espeleología, A.C. (Fundadora) Asociación Italiana Geográfica La Venta (Socia) Centro de Estudios Kársticos La Venta (Socia) Grupo Espeleológico Vaxakmen, A.C. (Socia) Grupo Espeleológico EspeleoZots en Chetumal (Asesora) Grupo Pionero de Espeleología en Sonora (Asesora) Association for Mexican Cave Studies (Colaboradora) Texas Speleological Association (Socia) Unión Mexicana de Agrupaciones Espeleológicas (Socia) 2014-06-21 0:42 GMT-05:00 David <[email protected]>: > In the news today, it was announced that the chemist credited with the > discovery of Kevlar, > has passed away. Stephanie Kwolek was her name. > > Sometime around 1986 or 87, I was taking a materials science course at > A&M and had access to a tensile-test machine. I asked the professor > if I could test a piece of 5mm Kevlar cord. > > I put a figure 8 knot in each end. and tied each end to the steel bar > connectors. I think I had about 15 inches between the knots. > > It broke in the middle of the upper knot at around 10,000 pounds. > The professor was > quite surprised. > > I used the cord in my Mitchell System, from my foot to an upper Jumar, > several times over a 2 year period, on some pits that were under 200 > feet. At the foot attachment, I tied the Kevlar cord into a > chicken-loop rig, described by James Jasek ( I think ) in a Texas > Caver in the late 70's or early 80's. So that the Kevlar cord was > the only thing holding my foot to the Jumar. I did not tie the cord > to the Jumar eye-hole, but wrapped it around the handle and tied it > off. > > While I would not recommend doing that now, I would say the cord is > light enough to throw in the cave-pack for an emergency or as a > back-up. > > David Locklear > > --------------------------------------------------------------------- > Visit our website: http://texascavers.com > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected] > >
