948f272 has the following force extension properties chemical fiber lexicon hans j koslowski deutscher fachverlag 11th edition pages 171 172 1997 the filament yarn builds up a constant force of 3 59 n in the first 8 5 of the extension path or in the first extension region 0 u03b5 1 this force remains constant over the further extension u2014 in the second extension region u03b5 1 u03b5 2 u2014 at 80 8 which corresponds to a total extension of 89 3 of the yarn thereafter the force increases in the third extension region u03b5 2 u03b5 3 to 11 36 n at 353 extension the constant course of the force is used for the fall damping element and the following increase of force acts as a safety reserve if there is a possible overload of the fall damper 0063 fig6 a and 6b show a first embodiment example of a fall damper with a filament yarn loop unloaded or respectively under load the fall damping element 3 consists of a yarn loop of polypropylene 948f272 with 836 wraps with a loop periphery of 1 856 m or l 0 928 m an upper and a lower protective sheath 4 u2032 4 u2033 act to protect the filament yarn against chafing at the connecting points to the upper and lower carabiner hooks 1 1 u2032 the protective sheaths 4 u2032 4 u2033 consist of a duplix 1t flexible tube mammut tec ag ch 5703 seon they are loosely pushed into a middle protective sheath 4 so that upon a fall the filament loops in the fall damper can freely extend fig6 b the middle protective sheath 4 consists of the same material as the protective sheaths 4 u2032 4 u2033 however.