COMPOSITE POLYESTER STRAPPING SPECIFICATIONS

SGS Certified Strength Ratings for DunLash Composite Strapping Systems

Independently Tested Composite Strapping Performance Data

DunLash composite polyester strapping is independently tested and certified by SGS South Africa, one of the world’s leading inspection, verification, testing, and certification companies. Every strapping product in our range undergoes rigorous tensile testing to verify linear breaking strength, system breaking strength with buckle combinations, and elongation performance under load.

The specifications below represent verified test results across our full composite strapping range, giving you the confidence to specify the right product for your cargo securing requirements.

DunLash Composite Strapping Range Overview

Our composite polyester strapping range covers six core products from light-duty bundling through to heavy-duty cargo restraint. All products are designed for one-way cargo securing applications across road, rail, and sea transport.

In addition to our Composite Polyester Strapping systems and products, we offer a full range of lashing systems and components to meet all your shipping needs:

• Lashing edge protectors
• Lashing accessories
• Lashing buckles
• Lashing tensioners
• Polyester Cargo Lashing

Understanding Composite Strapping Strength Ratings

Composite strapping performance is measured in two ways that matter for cargo securing decisions:

Linear Breaking Strength

This is the force required to break the strap on its own, without a buckle. DunLash composite strapping delivers linear breaking strengths from 313daN for our 13mm light-duty strap up to 1,654daN for our 32mm AAR-rated heavy-duty strap. Linear strength determines the baseline capacity of the strap itself.

System Breaking Strength

This is the force required to break the complete system — strap combined with a matched buckle in a closed-loop configuration. System strength is always higher than linear strength because the buckle distributes the load across a wider section of strap. DunLash composite strapping systems achieve system breaking strengths from 529daN up to 2,771daN depending on the strap size, buckle type, and loop configuration.

AAR-Rated Composite Strapping

For clients shipping cargo by rail or requiring Association of American Railroads compliance, DunLash offers AAR-rated composite strapping in our 32mm width. AAR-rated products undergo additional testing requirements and deliver higher breaking strengths than standard-grade strapping of the same width, making them suitable for intermodal and rail freight applications where securing standards are more stringent.

How to Select the Right Composite Strapping

Choosing the correct composite strapping depends on several factors:

• Cargo weight and dimensions — heavier or wider loads require wider straps with higher system strengths
• Transport mode — rail and sea freight generate more dynamic forces than short-distance road transport
• Load configuration — the number of straps, their placement, and the buckle type all affect total restraint force
• Compliance requirements — some industries and routes require AAR-rated or CTU Code compliant securing

DunLash provides application guidance to help you match the right strapping system to your specific cargo and transport conditions. Our team works with you to ensure the system is correctly specified for the job.

Applications of Composite Polyester Strapping

DunLash composite polyester strapping is used across South Africa’s logistics, manufacturing, and export sectors for:

• Bundling and unitising palletised goods for distribution
• Securing machinery, fabricated metal, and engineering components for transport
• Restraining break-bulk cargo moving through ports including Durban, Cape Town, Gqeberha, and Richards Bay
• Strapping timber, steel products, and construction materials for road and rail freight
• Replacing steel strapping in environments where operator safety and corrosion resistance are priorities

Safety Advantages Over Steel Strapping

Composite polyester strapping eliminates several hazards associated with steel strapping:

• No sharp edges that can cut operators or damage cargo surfaces
• No snap-back recoil when tension is released or straps are cut
• Corrosion resistant — performs reliably in coastal and humid environments
• Significantly lighter than steel, reducing operator fatigue in high-volume applications
• Easier to cut and remove after transport

Composite Polyester Strapping Specifications FAQs

What is the strongest composite strapping DunLash offers?

Our strongest composite strapping is the 32mm AAR-rated DC 105 AAR, which achieves a system breaking strength of up to 2,771daN when paired with a heavy-duty buckle in a double-loop configuration. This is independently verified by SGS South Africa.

Are DunLash composite strapping specifications independently verified?

Yes. Every product in our composite strapping range is tested and certified by SGS South Africa. SGS is a globally recognised inspection and certification company. Our specifications are based on verified test results, not manufacturer estimates.

What is the difference between linear and system breaking strength?

Linear breaking strength measures the strap alone. System breaking strength measures the strap combined with a matched buckle in a closed loop — this is the real-world strength of the complete securing system. System strength is always the relevant specification for cargo securing calculations.

Can composite strapping replace steel strapping?

In many cargo securing applications, composite polyester strapping provides a safer and more practical alternative to steel strapping. It eliminates sharp edge and recoil hazards, resists corrosion, and absorbs shock during transport. DunLash can assess your specific application to confirm suitability.

Is composite polyester strapping suitable for export cargo through South African ports?

Yes. Composite polyester strapping is widely used for export cargo moving through Durban, Cape Town, Gqeberha, Ngqura, and Richards Bay. Its shock-absorbing properties help maintain load integrity during port handling and sea freight.

Does DunLash supply AAR-rated strapping for rail freight?

Yes. Our 32mm AAR-rated composite strapping meets the Association of American Railroads testing requirements for intermodal and rail cargo securing. This is available for customers requiring rail-compliant solutions.

How do I know which strap width and buckle to use?

The correct combination depends on your cargo weight, transport mode, and compliance requirements. DunLash provides technical guidance to help you select the appropriate strap width and buckle type for your specific application. Contact our team for a recommendation.

Contact DunLash to discuss the right composite strapping specification for your cargo securing requirements.

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