Wow! The original post is over 2 years old and still going strong. Twisted Kevlar Thread #800 has a minimum breaking strength of 225lbs. I'm not sayin', I'm just sayin'...
Thats why i didn't take to much time to answer the question.
225lbs is nothing. Thats just for static loads. Repelling is dynamic and create a lot more force than that. It's also not just the strenght of the cord, but also if you can control you rappel. So you need a certain thickness for a belay device.
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