Which material is approximately three times stronger than the same size Manila rope?

• A. Composite fiber
• B. Nylon
• C. Cotton
• D. Sisal

Answer: (A)

Strength depends on the material and how the rope is made. Manila rope is a natural fiber rope, made from abaca, and its breaking strength is limited by natural variability and the inherent strength of that fiber. Composite fiber ropes use high-strength synthetic filaments (and often a binding matrix) woven or braided in a way that maximizes load-bearing capacity per diameter. This construction allows the rope to carry much more load for the same size because the strong filaments share the load more effectively and flaws are less influential.

So, for the same rope diameter, a well-made composite fiber rope typically has a much higher breaking strength, roughly around three times that of Manila rope in many common cases. Nylon, while strong, can vary in stretch and strength, and cotton or sisal are natural fibers with comparatively lower strength, making them unlikely to reach three times Manila’s strength for the same size.