The typical line material for lifelines is ___.

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Multiple Choice

The typical line material for lifelines is ___.

The line used for lifelines is chosen for buoyancy, durability in a wet environment, and ease of handling. Polypropylene is lighter than water, so it floats, which makes lifelines easy to spot and recover if dropped in the sea. The multifilament construction gives a soft, flexible rope that’s comfortable to grip, smooth to coil, and still strong enough for typical lifeline loads. It also resists absorbing water and decaying in saltwater, unlike natural fibers. In contrast, nylon would take on water and become heavier when wet, cotton would rot and sink, and Kevlar rope, while strong, is expensive, stiffer, and not buoyant—making it less practical for emergency lifelines that need to float and deploy quickly.

The line used for lifelines is chosen for buoyancy, durability in a wet environment, and ease of handling. Polypropylene is lighter than water, so it floats, which makes lifelines easy to spot and recover if dropped in the sea. The multifilament construction gives a soft, flexible rope that’s comfortable to grip, smooth to coil, and still strong enough for typical lifeline loads. It also resists absorbing water and decaying in saltwater, unlike natural fibers.

In contrast, nylon would take on water and become heavier when wet, cotton would rot and sink, and Kevlar rope, while strong, is expensive, stiffer, and not buoyant—making it less practical for emergency lifelines that need to float and deploy quickly.

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