Rope strength

Rope strength is an important basic characteristic and is measured in N (Newtons) at the point of rupture. Strength can also be measures in kN (kilo-Newtons) and daN (deca-Newtons).

1 kg = 0.981 daN
1,000 kg = 9.81 kN

Rope strength standards

Maximum strength is in accordance with accepted European norms:

  • EN ISO 1 346 - PP split film and PP Multitex
  • EN ISO 10 572 - Polysteel
  • EN ISO 1 140 - Polyamid
  • EN ISO 1 141 - Polyester
  • EN ISO 10 556 - Polyester / polyolefin duale fibres

The maximum strength of non-standard ropes is determined on the basis of our own laboratory measurements, and testing equipment certified and controlled by Germanischer Lloyd.

Factors influencing rope strength

  • rope construction
  • rope abrasion – scratched surface fibres can lead to decreasing strength
  • chemicals – the strength of ropes made from materials that are not resistant to certain chemicals can be significantly affected – store your ropes away from all chemicals!
  • heat – see the table of characteristics – store ropes away from heat sources!
  • sun (UV radiation) – store the ropes away from direct sunlight!
  • shock load
  • splicing – reduces rope strength by about 10 %, splicing must be done very carefully
  • knots – reduce rope strength around 50 % (up to 90% in steel ropes)
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