Synthetic Rope Usage EEC-0060 V1.2
Synthetic Rope Usage,
Inspection, and Retirement
by UV exposure, and the resulting strength degradation of exposed fibers is negligible.
Nylon is more susceptible to strength loss due to ultraviolet rays, but with both polyester
and nylon, the degree of susceptibility to UV damage is dependent on the type of fiber
and the various inhibitors with which the fiber manufacturer treats them.
Polyolefin and PBO fibers are severely affected by ultraviolet exposure,
especially in their natural, undyed, and/or uncovered states.
Harmful Chemicals
Certain chemicals can break down synthetic fibers. Sulfuric acids, alkalis, and chlorinate
hydrocarbons over 160° Fahrenheit should be avoided, while strong cleaning agents or
bleaches may be harmful. If you are unsure about the effect of a specific chemical,
contact Yale Cordage for more information.
Avoid Dynamic Loading
Dynamic loading of any line-synthetic, manila, or wire-produces a drastically
different set of physical properties and results, as compared with normal loading.
Dynamic loading is a jerking or snatching of a line, or a very sudden change in tension
such as from a relaxed state or low load to one of high load. A sudden drop off of a
platform from as short a distance as four inches actually doubles the rope’s load.
Similarly, an overwrap “falling” off the winch drum can result in a dynamic load. This
results in accelerated wear of the rope.
Fatigue
Synthetic fibers have memory: They remember and retain the effects of being
overloaded and dynamic loaded. This is why winch line procedures are so important to
reducing the danger of dynamic loading, which prolongs the life of the rope and reduces
premature down grading. If there is a reason to believe that a line has been dynamic
loaded above its recommended working load, it should be logged. If a number of these
instances occur, the line should be inspected and rotated.
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