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Semi-static standard

Semi-static ropes
Technical reference = Standard EN 1891
Static strength:
The force at which the rope breaks when loaded slowly. Type A ropes must attain or exceed 22kN, Type B ropes 18kN.
Static resistance with a figure of 8 knot:
The rope is terminated with a figure of 8 knot. Type A rope must withstand a load of 15kN for 3 minutes, and 12kN if Type B.
Number of falls:
This is the minimum number of falls (of factor 1) that the rope can sustain without breaking. The number of falls is determined on a test machine which can reproduce factor 1 falls, the rope being terminated by figure of 8 knots. The rope is subjected to falls at 3 minutes intervals, and must sustain a minimum of 5 successive falls holding a mass of 100kg for Type A, and 80kg for Type B.
NB: The fall factor is the ratio between the height of the fall and the length of rope which arrests it.
Impact force:
The force which is transmitted to the person, connecting elements and the anchor/belay when a fall is arrested. The impact force given in the performance table is that measured when a fall of factor 0.3 is arrested, using a 100kg mass for Type A, and 80kg mass for Type B rope.
Static extension:
The extension of the rope measured between loadings of 50 and 150kg. For semi-static ropes this must not exceed 5%.
Shrinkage in water:
The percentage by which the new and unused rope will shrink in length when it is soaked in water for 24 hours.
Shrinking the rope
Before first use of a semi-static rope (Hanked or on a reel) it should be shrunk to obtain its working length: To do this soak the rope in cold water, and then leave it to dry. (Preferably still on the reel or hank if possible).
Summary of standard EN 1891

Type
A
B
Diameter
9 to 16mm
Static resistance
2200kg minimum
1800kg minimum
Static resistance With fig-8 knot
1500kg 3 minutes
1200kg 3 minutes
Number of falls
5 falls factor 1 (100kg)
5 falls factor 1 (80kg)
 
Impact force (Factor 0,3)
< 600 daN
Extension between 50 & 150kg:
<-5%
<-5%
Sheath slippage
20 – 50mm (Diam. Dependent)
15mm maximum (0.66%)
Shrinkage in water
No limit

Unit of measure of the impact force

The KiloNewton: kN

1kN ~ 100kg force

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