6 GRAND PRIX SERIES Marlow’s Grand Prix Series offers a range of core options using Dyneema®, Vectran®. The performance advantages of each material vary, as explained below. DYNEEMA® offers by far the best strength to weight ratio of any material used in rope manufacture and is the material of choice for high-performance cores. At Marlow we offer a range of Dyneema® cores to suit strength and handling preferences as well as budget. DYNEEMA® is an Ultra High Molecular Weight Polyethylene (UHMWPE) and is available in a number of different grades. All grades of Dyneema® have excellent fatigue resistance (cyclic bending), UV resistance and abrasion resistance. However, due to it’s fairly low melting point, the heat resistance of Dyneema® is low. • S K78 SK78 is the standard Dyneema® material used. It has very high strength but significantly improved creep characteristics over its predecessor SK75. • S K99 is one of the newer Dyneema® materials. It offers exceptional strength (some 20% higher than SK78) and is unmatched in terms of strength to weight ratio. • D M20 has slightly lower tenacity than SK78, but has one major advantage in that it exhibits virtually zero creep, which can often have a negative affect on a rope’s performance and strength, at high loads for an extended period. VECTRAN® (LCP) has the best creep performance of any synthetic fibre and can offer improved resistance to heat compared to the UHMwPE family. STRENGTH The graphs below illustrate the comparative strengths of different core materials, based upon a 9mm core used in a 12mm rope. Fig. 1 shows the relative strengths of 9mm ropes made with different materials. However, whilst displaying break strengths comparable or better than Dyneema®, the additional weight of Vectran® (Fig.2) cannot compare to the strength to weight ratio of Dyneema® (Fig.3), illustrating why Dyneema® is preferred by the majority of racers. PRE-STRETCHING AND MARLOW MAX TECHNOLOGY Every Marlow Dyneema® core is pre-stretched to reduce “bedding in” elongation, limit the amount of elastic elongation and improve rope strength. We have been pre-stretching Dyneema® cores for over 25 years and that experience means we know exactly how to improve the rope’s performance without compromising flexibility or damaging the fibre. Marlow’s MAX Technology uses a precisely controlled process to take Dyneema® to the limits of heat and load during PreStretching. Introduced to offer the ultimate in strength realisation from the fibre and to minimise elastic and “bedding-in” elongation, MAX ropes are stiffer than standard pre-stretched cores. CORE TECHNICAL REFERENCE FIG. 1 CORE STRENGTH COMPARISON 9mm (CORE FOR 12mm ROPE CORE STRENGTHS) FIG. 2 CORE WEIGHTS (mm) FIG. 3 TENACITY (kg/G) ALB (kg) MASS (g/m) TENACITY (kg/g) 2000 10 50 0 0 0 D12 78 D12 78 D12 78 4000 20 100 6000 30 150 8000 40 200 10000 50 250 12000 60 300 14000 70 350 M-RIG MAX M-RIG MAX M-RIG MAX D12 MAX 78 D12 MAX 78 D12 MAX 78 D12 99 D12 99 D12 99 V12 V12 V12 D12 MAX 99 D12 MAX 99 D12 MAX 99 A BLUE OCEAN® INITIATIVE AS OF 2020, ALL OF OUR STANDARD SK78, SK99 AND DM20 PRODUCTS ARE MADE USING BIO-BASED DYNEEMA® FIBRE.
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