Answer from Ningbo Changshi: While some smaller, lighter strings can be reused for non-critical, manual pulls, a professional-grade pulling rope is not designed for repeated heavy-duty use. Its lifespan is directly affected by several critical factors:

• Tensile Load: Each time a rope is used for a pull, its internal fibers are subjected to stress. Pulling a heavy cable can permanently stretch and weaken the rope, even if it doesn't break during the pull. Using a rope close to its maximum working load will significantly reduce its lifespan.

• Abrasion and Friction: Pulling a rope through tight or dirty conduits with sharp bends causes internal and external abrasion, which degrades the fibers over time.

• Chemical and Environmental Exposure: Exposure to oils, acids, alkalis, and UV radiation from sunlight can weaken a rope's material. Our synthetic ropes are treated to resist these elements, but proper care is still essential.

• Knots: Tying knots in a rope can reduce its tensile strength by as much as 50%, making it unsafe for future pulls.

For these reasons, we advise inspecting all pulling ropes before and after each use. Any signs of wear, fraying, or discoloration are indicators that the rope's integrity has been compromised and it should be replaced. This is a critical safety practice we emphasize to all our clients.