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Steel vs Polypropylene vs Composite Strapping

Strapping isn't interchangeable across materials — steel, polypropylene, and composite each suit different loads and applications, and the wrong choice either under-secures a load or costs more than the job needs. This rounds out our Cordstrap comparison posts by covering where steel strapping fits. Steel strapping Highest tensile strength — suited to heavy, rigid, or high-value loads that need maximum holding force. Low stretch — holds a load tight without give, which matters for loads that can't shift at all in transit. Best for — steel coils, heavy timber, machinery, and other loads where a lighter strap simply can't provide enough force. Browse our Strapping collection for steel strapping options. Polypropylene (PP) strapping Lightweight and low cost — the default choice for general carton and light pallet securing. Some stretch and recovery — absorbs minor shifts in a load without snapping, useful for less rigid loads. Best for — cartons, general palletised goods, and lighter loads where steel's extra strength isn't needed. Shop our Polypropylene Strapping range, including PP strapping buckles. Composite strapping (e.g. Cordstrap) Combines strength and flexibility — designed to sit between steel and PP, without steel's sharp edges or rust risk. Safer to handle — no sharp edges on cut ends, and doesn't corrode like steel can in damp environments. Best for — timber framing and trusses, container securing, and loads where steel's edge and corrosion risk are a genuine concern. We've covered composite strapping in more depth in our Cordstrap vs Cordlash and Cordstrap vs the Alternatives posts. Material Strength Stretch Handling Typical use Steel High Minimal Sharp edges, can rust Heavy/rigid loads, coils, machinery Polypropylene Lower Moderate Safe, lightweight Cartons, general pallet loads Composite High Low-moderate Safe, no rust Timber, container securing The quick answer Choose steel when you need maximum holding force and the load can tolerate the handling risks. Choose polypropylene for general, lighter-duty carton and pallet work where cost matters most. Choose composite when you want steel-level performance without the sharp edges or corrosion risk — particularly for timber and container securing. View our full Tape, Strapping & Securing range to compare products across all three materials. Frequently asked questions Is composite strapping a direct replacement for steel?In many applications, yes — it's designed to offer comparable holding force with safer handling, though very heavy or rigid loads may still call for steel. Does polypropylene strapping rust?No — it doesn't corrode, which is part of why it's a common default for general use, though it doesn't match steel's holding force. What tools do I need for each strapping type?Each material generally needs its own tensioner and sealer system — check compatibility before mixing strapping types with existing tools. Can I get a strapping system set up for my site?Contact sales@nzpackaging.nz and we'll help match strapping material, tools, and buckles to your load types.