This is from a website;
http://info-central.org/recovery_cordinfo.shtmlSpectra Cord
Spectra cord comes in 2.0mm and 5.5mm diameters and is much like Kevlar in its properties. Spectra will not melt or stretch and is extremely strong for it's size and weight. It is so strong, climbing manufacturers routinely say it is 10 times stronger than steel. What makes this cord different is that the spectra fibers are on the inside with a nylon sheath woven over them to protect them from abrasion. Note: The spectra cord is relatively stiff and slick, because of this, only a triple fisherman's knot is recommended to tie it with.
This is from REI's website;
Cut about an inch longer than you need. Work a half inch of the core out of the sheath and cut it off. Smooth the sheath back and melt it into a smooth, hard "cap" on the end of the cord. This method of finishing will allow the cord to fit into the holes drilled in hexentrics. To get a clean cut on SpectraŽ cord, it may be necessary to use cable cutters.
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