4 Strands Twisted Polypropylene (PP) Mooring Rope is a practical,
cost-effective rope tailored for mooring scenarios, featuring a 4-strand twisted structure (more balanced than 3-strand options for load distribution) and
polypropylene as the core material. Its availability in standard
lengths (100m, 200m) and customized cuts adapts to diverse mooring
needs—from small watercraft to inland vessels—while leveraging PP’s
inherent advantages of corrosion resistance and lightweight design.
Below are its core features and targeted application scope:
Compared to common 3-strand twisted ropes, the 4-strand design
distributes tension more evenly across each strand, reducing the
risk of stress concentration and single-strand breakage. The tight
twisting enhances the rope’s overall structural integrity, allowing
it to withstand steady mooring forces (e.g., vessel sway from
waves, wind pull) without excessive stretching or deformation. This
balance also minimizes "hockling" (kinking or twisting) during
deployment, ensuring smooth handling when tying mooring knots.
PP is inherently non-absorbent and corrosion-proof—a critical advantage for mooring. Unlike natural fibers (e.g.,
cotton) that rot, mildew, or gain weight when wet, this rope repels
water, maintaining its strength and lightweight properties even
after prolonged exposure to saltwater (coastal mooring) or
freshwater (inland lakes/rivers). It also resists chemical erosion
from marine pollutants or freshwater algae, extending service life.
The 4-strand twisted construction retains good flexibility,
allowing the rope to bend smoothly around mooring cleats, bollards,
or hooks without cracking or stiffening. PP’s slightly textured
surface enhances friction, ensuring common mooring knots (e.g.,
cleat hitch, bowline, round turn and two half-hitches) stay tight
and slip-resistant—even under dynamic loads (e.g., vessel
movement). This flexibility reduces operator effort during
tying/untieing, making it suitable for both professional mariners
and recreational boaters.
PP is significantly lighter than alternative mooring materials
(e.g., nylon, polyester, or steel). A 100m or 200m length of
4-strand PP mooring rope is easy to carry, coil, and store on board
(e.g., in boat lockers) without occupying excessive space or adding
unnecessary weight to the vessel. This lightweight property also
simplifies on-site adjustments (e.g., shortening or extending the
mooring line) and reduces fatigue during manual handling—ideal for
small boats where crew size is limited.
Beyond standard 100m and 200m rolls, the rope supports customized
length cuts (e.g., 50m for small dinghies, 150m for medium-sized
fishing boats). This versatility ensures a perfect fit for
different mooring scenarios: short lengths for tight marina slips,
longer lengths for offshore buoys or vessels requiring extra line
to accommodate tide changes. Customization also eliminates waste
(no need to trim excess rope) and lowers costs for users with
specific length requirements.
PP is an economical synthetic material, making this rope more
affordable than high-performance alternatives (e.g., polyester
mooring rope or steel-reinforced ropes) while meeting
basic-to-moderate mooring demands. Additionally, its resistance to
rot, mildew, and water damage means it requires minimal
maintenance—no need for regular cleaning, drying, or coating.
Simply rinse with freshwater after saltwater use and store in a dry
place to maintain performance, reducing long-term upkeep costs.
- Target Vessels: Dinghies, kayaks, canoes, jet skis, small sailboats (under 8
meters), and recreational fishing boats.
- Scenarios: Mooring at marinas, private docks, lakefronts, or coastal
anchorages. The rope’s lightweight and knot stability make it easy
for hobbyists to handle, while its corrosion resistance stands up
to occasional saltwater or freshwater exposure. Standard 100m
lengths are sufficient for most recreational slips, while
customized shorter lengths (30-50m) work for small craft like
kayaks.
- Target Vessels: Inland cargo boats (carrying grain, coal, or construction
materials), tugboats (small to medium), and ferry boats
(short-distance routes).
- Scenarios: Mooring at river ports, canal docks, or lake harbors. Freshwater
resistance prevents degradation from algae or sediment, and the
4-strand structure’s load-bearing capacity handles the steady pull
of vessels in calm to moderately choppy inland waters. 200m lengths
are ideal for vessels needing longer lines to account for river
tides or dock spacing, while customized lengths fit specific berth
requirements.
- Scenarios: Temporary anchoring for boats during maintenance (e.g., dockside
repairs), emergency mooring after equipment failure (e.g., broken
primary mooring lines), or temporary securing of floating
structures (e.g., pontoons, rafts). The rope’s affordability and
easy availability (in standard lengths) make it a practical backup
option, while its flexibility allows quick deployment in urgent
situations.
- Target Vessels: Small commercial fishing boats (coastal inshore fishing),
oyster/mussel farm boats, and tourist boats (short coastal tours).
- Scenarios: Mooring at small coastal harbors or near aquaculture sites.
Saltwater resistance ensures durability in marine environments, and
the rope’s strength supports the occasional load of fishing gear or
small cargo. Customized lengths (e.g., 120m, 180m) can be tailored
to the specific distance between boats and mooring buoys in
aquaculture areas.
- Scenario: Serving as a secondary or auxiliary mooring line for larger ships
(e.g., cargo ships, cruise ships) when docked. While not suitable
for primary load-bearing (due to PP’s lower tensile strength
compared to steel or high-modulus fibers), it can be used to
stabilize the vessel’s position, secure non-critical areas (e.g.,
gangways), or as a backup line for primary mooring systems.
Standard 200m lengths provide enough coverage for the perimeter of
larger vessel decks.

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 |