Reliable mooring lines made with Dyneema® SK78 fiber enable your vessel to go to the Artic and the Equator and everywhere in-between 

Reliable mooring lines made with Dyneema® SK78 fiber enable your vessel to go to the Artic and the Equator and everywhere in-between 

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January 3, 2023

Safe and reliable mooring requires dependable rope behavior. In a series of articles, we have deep dived into the silent saboteurs that degrade rope performance and safety margins: Fatigue, Abrasion, Creep, and extreme Temperatures, the FACTs. In this article we will look at the fourth issue – the effect of extreme temperatures on synthetic rope fibers, the most common core fibers used in mooring ropes. Are you right to worry about the performance of mooring lines in high temperature conditions? 

Performance in extreme conditions.

Freezing arctic conditions and extremely low temperatures have no effect on the performance of Dyneema® SK78 fiber. However, many of the world’s major trading routes use ports on and around the Equator, where ambient temperatures are high. In these high temperature conditions, the strength of synthetic fibers slightly decreases. Combine this with ropes under high loads, and there will be an acceleration in rope fatigue, abrasion, and creep. 

Yet not all synthetic fibers perform the same. For example, Dyneema® SK78 fiber, there is only a slight reduction in strength which starts to occur above 70 degrees Centigrade. If the temperature peaks for a short duration (for example a few extremely hot hours in the middle of the day), Dyneema® SK78 fiber will then recover most of its original strength as the temperature drops. 

The challenge is to predict the performance of rope over its lifetime while operating in various conditions, including the hottest parts of the world.

Testing models can predict service life

The mooring experts with Dyneema® have developed a rope temperature model that enables rope manufacturers to predict rope performance and service lifetime in any climate, and under all service conditions. In a recent analysis, mooring lines made with Dyneema® SK78 fiber have delivered service lifetimes of up to 15 years for voyages taking place between Europe and the Middle East.

Ask the experts to model your situation

Selecting the right material with the right rope design is essential when looking for more durable breast, head, spring, and stern mooring line systems. Dyneema® SK78 fiber is engineered to deliver trusted strength, longer service life, and reliable performance in all temperature conditions. Check out the video below to dive deeper into temperature, including a case study that demonstrates the temperature model with a vessel that travels between the Middle East and Europe. To continue the conversation, scan the QR code below or contact the mooring experts with Dyneema® by using this link Connect to an expert (

Dyneema®, with you when it matters. Always.

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