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.
