10 GRAND PRIX SERIES The interaction between rope core, cover and deck hardware all contribute to the way a rope performs. The Grand Prix series blends technical materials to impart application specific properties to the cover. By blending different materials in varying ratios, we are able to optimise each material’s properties to produce the perfect rope performance. The data on page 11 details our standard blend covers and their relative performance in terms of abrasion resistance, load holding capability and winch easing. Grand Prix Series covers can be specifically and uniquely customised to particular requirements using different material blend ratios and blends of 3 or even 4 materials. COVER CONSTRUCTIONS All Marlow Grand Prix series ropes are fully customisable to achieve the desired performance characteristics. This includes customising the cover construction as appropriate. 24 plait – thicker cover, offers excellent grip, good durability and flexibility. Easy to splice with all core configurations and is the standard cover construction for most running rigging applications. 32 plait – thinner cover, smooth running through blocks and sheaves. Often used when a larger core is needed for strength without increasing diameter, but is more technical and time consuming to splice than 24 plait. 48 plait – very thin cover, very smooth and easily expandable. Normally made with Dyneema® offering outstanding resistance to abrasion so used for chafe gear and covers for loops and lashings. Also used for standing rigging overbraids. COVER TECHNOLOGY FIBRE STRENGTH MODULUS ELONGATION SPECIFIC GRAVITY MELTING POINT °C CRITICAL TEMPERATURE °C CREEP PERFORMANCE CHEMICAL RESISTANCE UV RESISTANCE G/DEN GPA G/DEN GPA DYNEEMA® SK99 (UHMWPE) 48 4.1 1800 132 3.6 0.975 144-152 80 GOOD EXCELLENT VERY GOOD DYNEEMA® SK90 (UHMWPE) 44.7 3.8 1625 140 3.5 O.975 144-152 80 GOOD EXCELLENT VERY GOOD DYNEEMA® SK78 (UHMWPE) 40 3.4 1267 110 3.5 0.975 144-152 80 GOOD EXCELLENT VERY GOOD DYNEEMA® DM20 (UHMWPE) 35 3 1042 90 3.6 0.975 144-152 80 VERY GOOD EXCELLENT VERY GOOD ZYLON® TYPE HM (PBO) 42 5.8 1948 270 2.5 1.56 650 N/A VERY GOOD FAIR POOR ZYLON® TYPE AS (PBO) 42 5.8 1302 180 3.5 1.54 650 N/A VERY GOOD FAIR POOR ZYEX® (PEEK) 6.5 - - - 30 1.3 334 250 N/A VERY GOOD VERY GOOD TEFLON® (PTFE) 2 0.36 13 - 8.5 2.1 310 288 N/A EXCELLENT EXCELLENT TECHNORA® (PARA-ARAMID) 27 3.4 590 73 4.5 1.39 500 N/A VERY GOOD FAIR FAIR TWARON® (PARA-ARAMID PPTA) 23 2.9 600 78 3.55 1.44 450 N/A VERY GOOD FAIR FAIR VECTRAN® (LCP) 25.9 3.2 600 75 3.8 1.41 350 N/A EXCELLENT GOOD GOOD POLYESTER 9.5 1.13 125 15 12.5 1.38 260 N/A GOOD AFFECTED BY ALKALIS VERY GOOD POLYAMIDE (NYLON 6) 8.7 0.96 80 8 24 1.14 220 N/A GOOD AFFECTED BY ALKALIS GOOD STANDARD MARLOW CORE TO COVER RATIOS CORE COVER MATRIX COVERED ROPE DIAMETER (mm) 6 7 8 9 1011121416 CORE DIAMETER (mm) 4 5 6 6.5 7 8 9 11 12 COVERED ROPE DIAMETER (mm) 18 20 22 24 26 28 30 CORE DIAMETER (mm) 13 15 16 18 19 20 22 1400 1600 CYCLES TO BREAK ABRASION RESISTANCE TEST PERFORMED AROUND 2” HEAVILY GNARLED BAR MGP DYNEEMA 50 1000 0 800 600 400 200 1200 LOAD HELD IN CLUTCH/JAMMER LOAD HELD (kg) MGP DYNEEMA 50 MGP D TECH 50 MGP M TECH 50 MGP M-GRIP 50 MGP PBO 50 MGB PBO 100 MGP NOMEX 50 MGP TECH 50 MGP VECTRAN 50 MGP RACING (32 PLAIT) MGP RACING (24 PLAIT) 0 500 1000 2500 3000 1500 2000 D2 RACING (24 PLAIT PES) MGP TECH 50 MGP PBO 100 MGP VECTRAN 50 MGP PBO 50 MGP D TECH 50
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