Description
Polyester Double Braid is a rope made with two braided components:
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Inner core (braided core): A braided rope at the center that carries the primary load.
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Outer sheath (braided cover): Another braided layer that protects the core and contributes to strength and abrasion resistance.
This dual-braiding construction provides a rope that is strong, flexible, and resistant to wear and environmental degradation.
🔹 Structure and Construction:
1. Core:
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Constructed from high-tensile polyester fibers.
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Carries most of the load.
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Braided structure improves flexibility and reduces twisting under load.
2. Cover:
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Also made from braided polyester yarns.
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Provides protection against abrasion, UV rays, and chemical exposure.
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Shares the load with the core (especially in high-quality constructions).
3. Balance:
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In high-performance double braid ropes, the core and cover are load-balanced, meaning both share the tension load evenly.
🔹 Key Characteristics:
| Property | Description |
|---|---|
| Material | 100% high-tenacity polyester (sometimes blends exist) |
| Strength | High tensile strength; varies by diameter (e.g., ½” can exceed 6,000 lbs) |
| Stretch | Low stretch under load (~2-3% at working loads) |
| Abrasion Resistance | Excellent, especially with tight braiding |
| UV Resistance | Very good, ideal for prolonged outdoor use |
| Water Absorption | Minimal (~0.5%), retains strength when wet |
| Handling | Soft, flexible, easy to splice and coil |
| Melting Point | ~260°C (500°F) |
| Density | ~1.38 g/cm³ (will not float in water) |
🔹 Common Uses:
| Industry | Application Examples |
|---|---|
| Marine | Dock lines, anchor lines, sheets, halyards |
| Industrial | Winch lines, pulling lines, slings |
| Theater/Rigging | Flying effects, curtain rigging |
| Arborist | Climbing lines, rigging lines |
| Outdoor/Recreation | Tent guy lines, rescue systems |
🔹 Advantages:
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Maintains strength and integrity when wet.
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More durable than nylon in sunlight and abrasive conditions.
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Low stretch makes it ideal where minimal elongation is needed.
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Doesn’t become stiff or brittle over time.
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