Poly-Dacron combination rope—often called Poly-Dac—is one of the most versatile ropes on the market for demanding utility, rigging, and safety applications. It combines the tensile strength and abrasion resistance of polyester with the lightweight, flexible, buoyant properties of polypropylene. It gives crews a single-rope construction that handles a wide range of jobs without compromising strength or durability.

At Erin Rope Corporation, we manufacture 3-strand twisted poly-dacron combination rope in diameters from 1/4” to 2”. This guide covers what makes the combination construction different, where it fits on the job site, and how it compares with alternative rope types.

What Is Combination Rope?

Combination rope is exactly what the name suggests: a rope built from two different fiber types that work together to deliver performance characteristics neither fiber achieves on its own. In Poly-Dac, that combination is a high-tenacity polyester (Dacron) cover wrapped around a polyolefin core.

The polyester cover carries the abrasion, UV, and tensile load. The polypropylene core keeps the rope lighter and more flexible than a solid polyester rope while adding buoyancy. The result is a rope that handles like polypropylene, wears like polyester, and delivers a working profile neither fiber matches on its own.

The 3-strand twisted construction adds a second layer of engineering. Three individual strands are twisted together in a right-hand lay, producing a rope with good grip, moderate stretch, and straightforward splicing. Twisted ropes have been used in marine, utility, and rigging applications for generations because they’re predictable, easy to inspect, and easy to terminate.

How Poly-Dac Compares to Other Constructions

Rope Type	Strength	Abrasion Resistance	Best For
3-Strand Poly-Dac	High	Superior	Rigging, fall protection, general utility
3-Strand Polypropylene	Moderate	Moderate	General purpose, marine, tie-downs
3-Strand Nylon	Very High	High	Shock loading, mooring, towing
3-Strand Manila	Moderate	Moderate	Traditional rigging, decorative, agricultural
Double Braid	Very High	High	Heavy pulling, cable installation

Poly-Dac occupies a specific niche: applications that need higher abrasion resistance than straight polypropylene can deliver, but don’t need the elongation of nylon or the higher price point of a full polyester or double braid rope. For crews running general utility, rigging, and safety line work, that combination hits a practical sweet spot.

Performance Characteristics

High Strength with Low Stretch. The polyester cover carries most of the tensile load and elongates minimally under working conditions. That matters for rigging and load control, where excessive stretch reduces precision and can create safety risks under dynamic loads. Break strengths range from 1,300 lbs. at 1/4” to 62,000 lbs. at 2” diameter.

Superior Abrasion Resistance. The high-tenacity polyester cover holds up better than polypropylene or manila against friction from hardware, edges, and repeated use. On job sites where rope is running over rough surfaces or through pulleys and sheaves, that abrasion resistance extends service life.

Meets ANSI and OSHA Standards for Fall Protection. The 5/8” and 3/4” diameters exceed ANSI and OSHA standards for fall protection applications, making them suitable for lanyards, safety lines, and lifeline use. This compliance benefit distinguishes Poly-Dac from most general-purpose rope. Always verify the specific application requirements before selecting rope for fall protection work.

Resistant to Rot, Mildew, Petroleum, and UV. Both polyester and polypropylene resist water absorption, so the rope won’t rot, mildew, or swell in wet conditions. It also withstands petroleum products, common industrial chemicals, and prolonged UV exposure. That combination makes it a reliable choice for outdoor and industrial environments where rope sees varied exposure.

Buoyant. The polypropylene core keeps the rope buoyant in water. This is a functional advantage in marine, dockside, and utility applications where rope may be dropped or need to be retrieved from the water.

High-Visibility Design. The rope is manufactured white with a red tracer, making it easy to identify on the job site and easy to spot during inspection. For safety-critical applications, that visibility is a practical asset.

Common Applications

• Rigging and load handling
• Fall protection lanyards and safety lines (5/8” and 3/4” diameters)
• Utility line work and cable pulling support
• Marine and dock applications
• Tow lines and general-purpose pulling
• Arborist and tree work
• Industrial hoisting and material handling
• Tie-downs for heavy or high-value loads

The wide diameter range lets Poly-Dac scale from light-duty tie-off work to heavy industrial rigging without switching rope constructions. Crews that stock a range of diameters can meet most job requirements with a single product line.

Specs

Part Number	Diameter	Length	Min. Break Strength	Density (lbs./100 ft.)	Pkg. Weight
PDTW080600	1/4″	600 ft.	1,300 lbs.	1.7	10.2 lbs.
PDTW120600	3/8″	600 ft.	4,047 lbs.	3.6	21.6 lbs.
PDTW160600	1/2″	600 ft.	5,875 lbs.	6.5	39.0 lbs.
PDTW200600	5/8″	600 ft.	8,946 lbs.	9.5	57.0 lbs.
PDTW240600	3/4″	600 ft.	10,192 lbs.	12.5	75.0 lbs.
PDTW320600	1″	600 ft.	17,000 lbs.	22.0	132.0 lbs.
PDTW360600	1-1/2″	600 ft.	34,000 lbs.	46.0	276.0 lbs.
PDTW400600	2″	600 ft.	62,000 lbs.	82.0	492.0 lbs.

Most diameters are also available in 1,200 ft. lengths. Tensile strengths are determined from tests on new, unused rope in accordance with standard test methods of the Cordage Institute. Full part numbers and packaging details are available on our product page and downloadable cut sheet.

Tips for Sales Teams

Lead with the combination advantage. Poly-Dac’s core selling point is that it delivers polyester-level abrasion resistance and strength at a lighter weight and lower price than a full polyester rope. For customers stuck between polypropylene (too weak or too abrasive) and polyester (too heavy or too expensive), Poly-Dac is the right middle ground.

Know the fall protection compliance boundary. The 5/8” and 3/4” diameters meet ANSI and OSHA fall protection standards. Smaller diameters do not. Be clear about which sizes qualify for safety-critical applications, and always direct customers to verify their specific standards requirements before use.

Emphasize the visibility feature. The white-with-red-tracer color is a functional specification for safety and rigging work. It makes the rope easier to identify at a glance, inspect for wear along its length, and distinguish from other ropes on a crowded job site.

Offer it alongside straight polypropylene and nylon. Poly-Dac isn’t a replacement for polypropylene or nylon applications. Recommend polypropylene for light-duty, cost-sensitive work. Offer nylon for high-elongation, shock-absorbing applications. Poly-Dac fits in the middle when crews need durability, moderate stretch, and higher strength without paying for a full polyester construction.

A Trusted Supplier Since 1998

Erin Rope is a family-owned rope and cable supplier that has served utility, construction, and industrial customers since 1998. We stock 3-Strand Twisted Poly-Dacron Combination Rope in all standard diameters and lengths, with same-day shipping from one of the industry’s largest in-stock inventories. When you call, a knowledgeable team member answers and helps you spec the right rope for your application.

Browse the full 3-Strand Twisted Poly-Dacron Combination Rope lineup at erinrope.com/3-strand-poly-dacron-combination-rope, or call us at 708-377-1084 for product guidance and sales questions.