Light and strong

A steel wire rope that floats on water – only a few years ago most people would have regarded the idea as ridiculous. Now it has been made possible with the introduction of the super high tenacity fibre Dyneema®. DYNICE™ ropes make use of Dyneema®’s unique characteristics. DYNICE™ ropes exceed the strength of steel wire ropes of same diameter while floating on water. They have low elongation and are extremely flexible, yielding easy handling in all respects.

Service Life

The durability of a rope in general is determined by internal and external effects. Internal effects include yarn fatigue during bending or tensioning, or caused by friction between the yarns in the rope. Due to the low friction of Dyneema® fibres and their very good flex and tension fatigue properties, these internal processes are of no concern in a DYNICE™ rope.

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Tension fatigue

Ropes made of Dyneema® have been tested according to the Thousand Cycles Load Level (TCLL) test of OCIMF (Oil Companies Int. Marine Forum). This is an accelerated fatigue test where the rope is repeatedly loaded and unloaded 1,000 times with loads of 50%, 60%, 70% and 80% of its breaking load. Residual strength is then determined. Contrary to all other ropes, the Dyneema® rope showed increasing strength as tests were carried out.

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Bending fatigue

DYNICE™ ropes should be used with a ratio of sheave/rope diameter greater than 10. This will help ensure a very long service life which, at normal working loads, will be at least as long as that of wire ropes. In addition environmental factors such as moisture, water and chemicals will attack steel and shorten its life time.

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Abrasion resistance

DYNICE™ ropes have very high abrasion resistance compared with ropes of other synthetic fibres. In extreme cases where the ropes come in direct contact with unpolished or corroded steel, they may need a special cover. Most often a braided cover of Dyneema® or other fibres will do. For maximum protection, an extruded cover can be applied.

Elongation and backlash

DYNICE™ ropes have very low elongation. Depending on construction, a new rope may have elongation at break as low as 5-6%. For worked rope the elongation will be even less, or from 3-4%. Low elongation in combination with low weight gives a low energy storage. If a conventional rope breaks the stored energy is released which produces a high speed and high energy backlash. Due to its low energy storage, a DYNICE™ rope which breaks yields much less backlash than wire ropes or polyamide ropes do. However, precautions should always be taken when DYNICE™ ropes are put under a high strain.