Which type of line is typically not used for applications requiring high strength?

Rope yarns are typically not used for applications requiring high strength because they are the smallest component of a rope, consisting of fiber strands twisted together. Rope yarns are often utilized as filler or for lighter tasks, such as for binding or lashing, but lack the tensile strength and durability required for heavy lifting or high-load applications.

In contrast, synthetic lines, Manila lines, and natural lines are generally constructed to withstand significant stress and are used in various maritime and industrial applications. Synthetic lines are made from materials like nylon or polyester, which offer high strength-to-weight ratios and increased resistance to environmental factors. Manila lines, being made from natural fiber from the abaca plant, provide good strength for traditional uses in various tasks. Natural lines can also be strong, depending on the material and construction, but they are less commonly preferred for high-stress applications compared to synthetic alternatives.