Which line has the least resistance to mildew and rot and should be inspected by opening the strands?

The choice of Manila line is based on its natural fibers and properties that provide resilience against mildew and rot. Manila rope, made from the abacá plant, is known for its strength, flexibility, and resistance to deterioration in moist environments. This resistance comes from the plant's fibers, which have a lower tendency to absorb water compared to synthetic materials and other natural fibers.

Inspecting by opening the strands is important because it allows you to evaluate the condition of the rope. While Manila is resistant to mildew and rot, it is still essential to check for any signs of wear or damage that could compromise its integrity. The fibers can become frayed or weakened over time, especially if they have been exposed to moisture consistently.

In contrast, other materials may demonstrate different levels of performance in wet conditions. For example, nylon can retain water and may be more susceptible to mold, while polypropylene, although lightweight and resistant to some extent, can degrade under UV exposure and may not hold up as strongly in marine environments. Wire rope does not suffer from mildew or rot but lacks the same flexibility and ease of inspection as natural fiber ropes.