Additional information: static strength tests - Petzl Denmark

Additional information: static strength tests


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Static strength tests

The following tests were done in labs; they were done on new ropes and devices, but it is impossible to recreate every scenario. Warning: we did not test every rope on the market; the results of these tests could be different with other types of rope.

The test values are given for information only, to give an idea of the loads involved in such situations.

Values recorded during tests with new ropes, certified to current European standards (EN 1891 low stretch kernmantel ropes, EN 892 dynamic ropes), and with static ropes (non CE).

Warning: older ropes are generally weaker.

Testing done with slow pulls, until the first signs of rope damage appear.

Warning: the rope damage values, recorded during the dynamic tests (falls/shock loads) are generally lower than with slow-pull: the frame-loaded ascenders are not designed to hold shock loads.

Static test


EN 1891 type A low stretch kernmantel ropes
Rope diameter Beginning of sheath damage
8 mm 4.9 kN
8.5 mm 5.5 kN
9 mm 5.4 to 5.9 kN
10 mm 5.7 kN
10.5 mm 5.4 to 6 kN
11 mm 5.3 kN
11.5 mm 6 kN
12.5 mm 6.4 kN
13 mm 6.4 kN
Static test


Dynamic rope

EN 892
Rope diameter Beginning of sheath damage
7.7 mm 5.1 kN
9.1 mm 5.3 kN
Static test


Static rope

(non CE)
Rope diameter Beginning of sheath damage
9.5 mm 5.1 to 5.3 kN
11 mm 6.2 to 6.4 kN
12.5 mm 5.9 to 6.3 kN