
2. Main performance
Material | Polyamide Multifilament | Polyamide Yarn | Polypropylene Multifilament | Polypropylene | Polyester | Polypropylene and Polyester Mixed |
Spec.Density | 1.14 no floating | 1.14 not floating | 0.91 no floating | 0.91 Floating | 1.27 no floating | 0.95 Floating |
Melting Point | 215℃ | 215℃ | 165℃ | 165℃ | 260℃ | 165℃/260℃ |
Abrasion Resistance | Very Good | Very Good | Medium | Medium | Good | Good |
U.V.Resistance | Very Good | Very Good | Medium | Medium | Good | Good |
Temperature resistance | 120℃max | 120℃max | 70℃max | 70℃max | 120℃max | 80℃max |
Chemical resistance | Very Good | Very Good | Good | Good | Good | Good |
3.Technology Comparison
Coil length: 220m
Spliced strength:± 10% lower
Weight and length tolerance:± 5%
MBL=Minimum Breaking Load conform ISO 2307
Other sizes available upon request

4.Parameter Table
Specification 规格 | PA Multifilament 锦纶复丝 | PAYarn 锦纶 | PP Multifilament 丙纶长丝 | Polypropylene 丙纶 | Polyester 涤纶 | PET/PP Mixed 丙纶/涤纶混合绳 |
Dia. | Cir | Ktex | KN | Ktex | KN | Ktex | KN | Ktex | KN | Ktex | KN | Ktex | KN |
直径 | 圆 周 | 线密度 | 破断强力 | 线密度 | 破断强力 | 线密度 | 破断强力 | 线密度 | 破断强力 | 线密度 | 破断强力 | 线密度 | 破断强力 |
4 | 1/2 | 10 | 3.7 | 10 | 2.6 | 6.3 | 2.3 | 6 | 2.1 | 12 | 2.9 | 7.0 | 2.8 |
6 | 3/4 | 22 | 7.9 | 22 | 6 | 18 | 6.5 | 17 | 5.9 | 27 | 5.6 | 17.5 | 6.8 |
8 | 1 | 40 | 13.8 | 40 | 10.9 | 32 | 11.4 | 30 | 10.4 | 48 | 10.0 | 31 | 11.9 |
10 | 1-1/4 | 62 | 21.2 | 62 | 15.7 | 47 | 16.8 | 45 | 15.3 | 76 | 15.6 | 48.5 | 18.2 |
12 | 1-1/2 | 89 | 30.1 | 89 | 24.1 | 68 | 23.9 | 65 | 21.7 | 110 | 22.3 | 69.9 | 25.7 |
14 | 1-3/4 | 121 | 40.0 | 121 | 33.0 | 95 | 32.9 | 90 | 29.9 | 148 | 31.2 | 95.1 | 34.7 |
16 | 2 | 158 | 51.9 | 158 | 42.5 | 121 | 40.7 | 115 | 37.0 | 195 | 39.8 | 124 | 44.8 |
18 | 2-1/4 | 200 | 64.3 | 200 | 53.9 | 155 | 51.9 | 148 | 47.2 | 245 | 49.8 | 157 | 56.1 |
20 | 2-1/2 | 247 | 79.2 | 247 | 66.7 | 189 | 62.6 | 180 | 56.9 | 303 | 62.3 | 194 | 68.7 |
22 | 2-3/4 | 299 | 94.0 | 299 | 80.4 | 231 | 75.0 | 220 | 68.2 | 367 | 74.7 | 235 | 82.1 |
24 | 3 | 355 | 112 | 355 | 93.6 | 273 | 87.7 | 260 | 79.7 | 437 | 89.6 | 279 | 96.3 |
26 | 3-1/4 | 417 | 129 | 417 | 111.5 | 320 | 101 | 305 | 92.2 | 512 | 105 | 328 | 113 |
28 | 3-1/2 | 484 | 149 | 484 | 127 | 373 | 115 | 355 | 105 | 594 | 120 | 380 | 130 |
30 | 3-3/4 | 555 | 169 | 555 | 143 | 425 | 132 | 405 | 120 | 682 | 134 | 437 | 148 |
32 | 4 | 632 | 192 | 632 | 161 | 483 | 146 | 460 | 132 | 778 | 154 | 497 | 167 |
36 | 4 - 1/ 2 | 800 | 240 | 800 | 200 | 614 | 182 | 585 | 166 | 982 | 190 | 629 | 210 |
40 | 5 | 987 | 294 | 987 | 241 | 756 | 221 | 720 | 201 | 1215 | 235 | 776 | 257 |
44 | 5-1/2 | 1190 | 351 | 1190 | 289 | 924 | 266 | 880 | 242 | 1468 | 275 | 939 | 308 |
48 | 6 | 1420 | 412 | 1420 | 338 | 1092 | 308 | 1040 | 280 | 1750 | 329 | 1110 | 364 |
52 | 6-1/2 | 1670 | 479 | 1670 | 393 | 1281 | 357 | 1220 | 325 | 2050 | 384 | 1320 | 424 |
56 | 7 | 1930 | 550 | 1930 | 450 | 1491 | 408 | 1420 | 371 | 2380 | 439 | 1520 | 489 |
High-quality marine-grade nylon filaments are selected as the base material, prioritizing filaments with high tensile strength, saltwater resistance, and UV stability—critical properties for withstanding harsh marine environments. The nylon filaments are first unwound from spools and passed through a tension-control system to ensure consistent fiber alignment, preventing uneven stress during subsequent processing. Any defective filaments (e.g., with cracks or uneven thickness) are removed to avoid compromising the final rope’s durability.
The prepared nylon filaments are grouped into smaller bundles (called “yarns”) and twisted together using a stranding machine. This twisting process imparts initial strength to the yarns and ensures tight cohesion between filaments. Multiple strands of these twisted yarns are then combined to form three separate “core strands”—the foundational components of the 3-strand rope. The number of yarns per core strand is adjusted to match the target diameter (20mm, 22mm, or 24mm), with thicker diameters requiring more yarns per strand.
The three core strands undergo a heat-setting treatment to stabilize their structure. This involves passing the strands through a controlled-heat oven (typically at 120–160°C) and then rapidly cooling them. Heat setting prevents the strands from unraveling or shrinking later, ensures consistent twist retention, and enhances the rope’s resistance to stretching under marine loads (e.g., tides or wind). It also helps lock in the nylon’s inherent water-resistant properties.
The three heat-set core strands are fed into a large twisting machine (called a “rope twister”) at a synchronized speed. The machine twists the three strands together in a clockwise or counterclockwise direction (depending on design specifications) to form the final 3-strand twisted rope. The twist density is carefully calibrated: too loose a twist reduces strength, while too tight a twist causes brittleness. During this step, the rope’s diameter is monitored in real time to ensure it meets the 20mm, 22mm, or 24mm target—adjustments to yarn count or twist speed are made if deviations occur.
After twisting, the rope undergoes a surface treatment to enhance its marine performance. This typically includes:
- A UV-inhibitor coating to boost resistance to sunlight-induced degradation;
- A water-repellent finish to minimize moisture absorption and prevent mildew;
- A smoothness treatment to reduce friction (critical for mooring, where the rope rubs against docks or cleats).
The finished rope is then inspected for quality: technicians check diameter consistency, tensile strength (via load-testing samples), twist uniformity, and surface integrity. Ropes that fail to meet marine-grade standards (e.g., insufficient strength or uneven diameter) are rejected.
Qualified ropes are cut to standard lengths (e.g., 50m, 100m, or custom lengths per demand) using precision cutting tools to ensure clean, fray-free ends. The cut ropes are then coiled into compact, easy-to-transport spools or hanks, with labels indicating diameter (20mm/22mm/24mm), material (marine-grade nylon), and intended use (mooring) for end-users.
- Recreational Boats & Yachts: Ideal for mooring small recreational boats (e.g., fishing boats, speedboats) and mid-sized yachts (6–12 meters) at marinas, piers, or buoys. The 20mm/22mm diameters suit lighter vessels, while the 24mm diameter handles heavier loads from larger yachts. The rope’s nylon construction resists saltwater corrosion and shock absorption, preventing damage from wave-induced jolts to the boat’s hull or dock cleats.
- Dinghies & Tenders: Used to secure dinghies or tenders (small auxiliary boats) to larger parent vessels or shorelines. Its flexibility allows easy tying to small cleats, and its durability withstands frequent handling and exposure to salt spray.
- Small Commercial Vessels: Suitable for mooring small commercial watercraft, such as workboats (used for harbor maintenance) or small cargo boats (transporting light goods in coastal areas). The rope’s tensile strength (enhanced by 3-strand twisting) secures vessels against tidal currents, while its abrasion resistance stands up to contact with concrete docks or metal pilings.
- Houseboats & Floating Cabins: Used for semi-permanent mooring of houseboats or floating cabins in calm inland waterways (e.g., lakes, rivers) or protected coastal coves. The 22mm/24mm diameters provide sufficient stability for stationary floating structures, and the UV resistance ensures long-term performance under prolonged sunlight.
- Temporary Stops: Perfect for short-term mooring during activities like fueling, passenger pickups, or rest breaks. Its easy handling allows quick tying and untying, and its water resistance ensures it remains functional even if submerged briefly (e.g., during high tides).
- Emergency Anchoring Backup: Serves as a backup mooring line for emergency scenarios (e.g., engine failure or sudden weather changes). The rope’s reliability and shock absorption provide temporary stability, allowing vessels to stay secured until help arrives or conditions improve.
- Dock Edge Protection: Used as auxiliary lines to secure floating dock sections or cushion the impact between docks and vessels. The 20mm diameter is often used for light-duty cushioning, while 22mm/24mm diameters reinforce dock connections to resist strong winds.
- Buoy Tying: Employed to tie mooring buoys to underwater anchors in sheltered bays or coves. Its nylon material resists submersion-related degradation, and the 3-strand structure ensures the buoy remains securely anchored.