All rope presented in this catalogue can be manufactured to custom specifications (reel length, diameter, colour, and materials used can all be varied according to requirements). Please contact us directly for any unique requirements you may have.
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Break load is an average result achieved under laboratory conditions, in straight-line pulls with constantly increasing tensile loads. These conditions are rarely duplicated in actual use. Do not use breaking load for design or rating purposes, use safe working load figures The breaking load is determined by taking the load that each line in a sample of five breaks and then dividing by five to determine the average breaking load. Break loads may vary slightly for individual reels, but safe working loads will not.
Safe Working Loads
Because of the wide range of rope use, exposure to the several factors affecting rope behaviour, and the degree of risk to life and property involved, it is impossible to make blanket recommendations as to working loads. However, to provide guidelines, working loads are tabulated for rope in good condition with appropriate splices, in non-critical applications and under normal service conditions. Please note that recommended the safe working load for all ropes presented in this catalogue is one fifth (1/5) of the breaking load.
Normal working loads are not applicable when rope is subject to significant dynamic loading. Instantaneous changes in load, up or down, in excess of 10% of the line’s rated working load constitutes hazardous shock load and would void normal working loads. Whenever a load is picked up, stopped, or swung there is an increased force due to dynamic loading. The more rapidly or suddenly such actions occur, the greater the increase will be. Examples could be picking up a tow on a slack line or using a rope to stop a falling object. Therefore, in all such applications such as towing lines, lifelines, safety lines, climbing ropes, etc., working loads as given do not apply. Users should be aware that dynamic effects are greater on a low stretch rope such as polyester than on a high stretch rope such as nylon, and greater on a shorter rope than on a longer one. The working loads listed contain provision for very modest dynamic loads. This means, however, that when the working load has been used to select a rope, the load must be handled slowly and smoothly for the working loads to be valid.
Dyneema® is a registered trademark of DSM. Spectra® is a registered trademark of Allied Fibres. Kevlar® is a registered trademark of the Dupont Corporation. Vectran® is a registered trademark Celenese Corporation. Technora® is a registered trademark of Twaron Teijin. PBO/Zylon® is a registered trademark of Toyobo. “Polyrene” and “Polysteel” are registered South African trademarks of Southern Ropes (Pty) Ltd.