Fibers used in the construction of ropes, twines and cordage can be broadly divided into two categories, namely natural and synthetic. Cotton, Jute, Manila and Sisal are the most commonly used natural fibres whereas Nylon, Polyester, Polypropylene, and Polyethylene are popular among synthetic fibers.
Recommended working loads are derived by taking 15-50% of New Rope Tensile Strength for Braided Rope, 8-11% for Twisted Rope and 10-14% for Twines and other ropes. Due to the inherent risks while in use, rope and cordage products are subject to highly variable conditions that change over time. Therefore, Design Factor selections and Working Load Limits must be calculated with consideration of exposure to risk and actual conditions of use for each application.
Break strength, if mentioned, is intended as a guide only and refers to new, unused products. If in doubt, always consult an experienced engineer or other qualified individual regarding the design, application and selection of a particular rope.