MGP Core Technology
Marlow’s Grand Prix Series offers a range of core options using Dyneema®, Vectran® and Zylon® (PBO). Each material has its own particular strengths and weaknesses.
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, but have poor heat resistance due to a relatively low melting point.
- SK78 is now the standard material offering very high strength but significantly improved creep characteristics over its predecessor SK75 or equivalents.
- SK99 is the very latest Dyneema® material. It offers exceptional strength (some 20% higher than SK78) and is unmatched in terms of strength to weight ratio.
- DM20 has slightly lower tenacity than SK78, but has one major advantage in that it exhibits virtually zero creep, which can often have a negative effect 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 UHMPE family, but is far heavier.
Zylon® (PBO) offers unrivalled strength/diameter performance coupled with exceptional resistance to heat and ultra-low elongation. However, PBO is very susceptible to UV degradation.