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What is a mooring line used for on a boat?

- The line that every sailing boat and motorboat needs, no matter what! -

This rope is required to secure the boat to its berth. It makes no difference whether the vessel is large or small, or whether it's a sailboat or a motorboat; every boat must be moored in the harbour or docked on the quayside at some point.

The mooring line must be able to withstand significant physical stress over a long period of time without failing. Dock lines should also be strong with high elongation, as well as buoyant if necessary. This is because mooring ropes can easily fall into the water. 

You can find out which materials are best suited for mooring ropes, what length and diameter they should have, and how many you should have on board in our mooring line guide. 

Why is elongation an important characteristic of mooring ropes?

Mooring lines are used to secure your boat to jetties, quays or anchor buoys. Swell caused by other boats or the wind subjects the boat to constant movement, so the mooring line needs to give a certain amount to compensate for this. If mooring lines did not stretch, the kinetic energy of the wave would be transfered to the cleats or fairleads to which the rope is attached on board and rip them out of their fixed holdings. Mooring lines with the correct elongation absorb swell loads, diffuse the kinetic energy of the wave and protect your boat and its fittings from damage.

Why is breaking load an important aspect of mooring lines?

Breaking load is a further important characteristic of docking lines. Mooring lines should be able to hold when pulled by several tonnes of weight. They should be able to resist such forces over many years and in all kinds of weather conditions. High strength is therefore paramount and lines should not go brittle or become porous and hard even when subjected to changing weather. Gleistein mooring lines excel at meeting these requirements and also feature flexible sheaths for top handling, are durable and have very low water absorption. 

What is mooring line made of?

Polypropylene mooring ropes are very light, buoyant, water resistant and therefore well suited for sailing. However, like other materials, they have disadvantages, e.g. a lower breaking load and stability.

Polyamide mooring ropes give you up to 10% more stretch. They have the advantage of being more elastic, which is also gentler on the mooring bollards, fairleads and cleats in choppy harbours with heavy swells. The downside is that this material absorbs water more quickly.

Polyester is not only break-proof, shrink-resistant and inexpensive, it also has a particularly high UV stability. Polyester also has a decisive disadvantage, namely its low stretch. 

Find out which material makes the strongest mooring line and which is right for you in our mooring line guide!