17 June 2012

How long do slings and quickdraws last?

Another interesting article from the Black Diamond Quality Control Lab - this time looking at slings and quickdraws. They used a bunch of different sling materials and did some pull tests to see how strong they were after they had been abraded, and also how strong they were after being loaded to 5kN 1000 times (to simulate in-situ gear that's taken a lot of falls), and 11kN cycled until failure.

Image from Black Diamond

Those slings that made it through the abrasion test didn't actually loose that much strength in general, but some slings broke during the abrasion cycling. Loading to 5kN 1000 times seemed to have almost no influence on strength, loading to 11kN produced unpredictable results.

They also mention that one previous finding was that int-situ slings seem to loose most strength in the first 10 weeks of being exposed - although this finding didn't agree some some other results.

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