Re: TreeFlex!
Just a note for the US market that tends to prefer a 5,000lb tensile strength rating to harnesses. 5,000lbs is about 23kN. The EN 813 standard (work positioning sit harnesses) pull tests harnesses to 15kN, but also subjects the harness to harsh 2metre (6ft) falls on 1m (3ft) lanyards with 100kg (220lb), specially weighted dummies. That makes for a harsh test for a harness that will never be subject to such conditions during typical safe working practice. However, it is possible if whizzing through a tree when the prusik jams mid jump, or falling a short distance on a low stretch doubled rope that didn't have slack sufficiently managed.
However, looking at other threads, some are concerned that this isn't sufficient a test to determine 'Durable Safety' (my term, not official, but I think explains the point well) i.e. sufficient safety reserves over time to ensure operational safety.
To help remove any doubt, TreeFlex has been pull tested to 30kN (6,600lbs)!!! This result wasn't surprising to us, as it also withstands the extremely harsh EN 361 tests of 4m fall (12ft) on a 2m (6ft) lanyard.
So, to use a simpler way of determining 'durable safety' via safety factors and Cycles to failure concepts during normal use (rather than a worst case scenario):
30kN Tensile(6,600 lbs) divided by an actual WLL of 250kg (550 lbs)= safety factor of 12! Thats thousands of cycles to failure for textiles. That gives a huge safety margin for wear to textiles through UV and abrasion. TreeFlex is made of abrasion resistant webbing.
Why 250Kg WLL (550 lbs)? Heavy climbers, worst case scenario in a rescue, heavy rigging gear and chainsaws, and surging forces in a swing, possibly all at the same time.
6,600 lbs Tensile strength / 4 lbs weight = AWESOME strength to weight ratio.
Tested for worse case scenarios, built for durable safety.
Both Ergonomic and technical competence.
Designed and tested for Roped Access, Work Positioning and Fall Arrest.
Does it come with a free climber to do the work for you? Err.....sorry; we can bake the cake, all you have to do is eat it!