Forums: Climbing Information: The Lab: Re: [cracklover] Clove hitch anchor equalization: Edit Log




rescueman


Jul 5, 2011, 11:50 AM

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Registered: Mar 1, 2004
Posts: 439

Re: [cracklover] Clove hitch anchor equalization
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cracklover wrote:
I have never heard of clove hitches in spectra failing in dynamic loading situations due to melting. Have you?

Spectra has a much lower melting point (<300F) compared to nylon (420-480F), an even lower critical temperature of 150F, and is more likely to fail in a shock-load. It also has high lubrisity or slipperiness, so it doesn't hold a knot (or clove hitch) as well.

I do not use Spectra (or any high-strength cordage) in any application, except as factory slings on protection. High strength-to-weight ratio is useless if it has a higher failure potential when the proverbial crap hits the fan.

Nylon cords and slings are still the most versatile, inexpensive and reliable in all applications and failure modes.

Check out the Tom Moyer/Black Diamond test report presented at the 2000 International Technical Rescue Symposium: http://www.xmission.com/...gh_Strength_Cord.pdf


(This post was edited by rescueman on Jul 5, 2011, 5:04 PM)



Edit Log:
Post edited by rescueman () on Jul 5, 2011, 5:04 PM


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