Which fibre is commonly used in water rescue rope?

Polypropylene is commonly used in water rescue rope due to its unique properties that suit this specific application. One of its most significant advantages is that it is lightweight and has a lower density than water, allowing it to float. This buoyancy ensures that the rope remains accessible on the water's surface, which is crucial during water rescue efforts where quick access to the rope can save lives.

Additionally, polypropylene exhibits good resistance to moisture, making it ideal for use in wet conditions, as it does not absorb water. This characteristic helps maintain the rope's strength and performance over time, even with repeated exposure to the elements and while in use during rescues.

While other fibers like olefin and polyester are also strong and durable, they do not possess the same advantageous floating property that polypropylene offers, which is critical for effective water rescue operations. Spectra, although known for its high strength-to-weight ratio, is typically more expensive and is not as widely used for water rescue ropes as polypropylene.