reep

The cords are generally constructed in the same way as the ropes (the same material, core and sheat), but they are only designed to be submitted to static loading - and thus may not absorb dynamic energy!!! Simply put, they cannot absorb the fall energy by themselves (i.e. the climbers may neither use them as harnesses, nor fall on them), though given accurate dimensioning, they could be used for anchoring or similar purposes.

The major requirements imposed upon accessory cords are defined by ČSN EN 564:

• the diameters shall range from 4 mm to 8 mm
• the minimum strength shall amount to 200 N/mm² of the section
• the nominal diameter and rupture strength are given in the table below

Note.: 1 daN corresponds to the carrying capacity of approximately 1 kg (exactly 0.981 kg)

Even smaller diameters of the same constructions are produced, though their scope of application is very specific:

• 2 mm diameter - avalanche cord (or as a decorative cord for clumber pendants)
• 3 mm diameter - for the biding of hammers and tools to prevent them from getting lost in the rocks or caves (the strength is approx. 1.4 kN - can withstand approx. 140 kg)
• 9 mm diameter - with higher required strength and safety levels, 9-mm diameter accessory cord can be used

Important Notice:
Accessory cords are frequently used with prusiking. Because the sheat of the cords is relatively weak, it has to be continually checked whether the sling is not getting damaged - worn-through - due to its continual displacement along the rope. Any sign of damage means that the prusiking knot has to be re-fastened in such a way as to ensure that the non-disturbed surface of the rope gets into contact with the rope at all times. If the core is sneaking out of the sheat, the disturbed portion of the cord has to be cut off, or the cord should be preferably discarded.
As well as the ropes, the material of the accessory cords is subject to aging. We recommended that the cord be replaced after 5 years of service.