Meta description: PET strapping band and steel strapping differ in strength, elongation, safety and cost per pallet. Compare both materials before specifying export loads.
PET strapping band and steel strapping are both used to unitize heavy loads, but they behave very differently under tension, moisture and impact. PET is a polyester strap that stretches slightly and recovers, holds tension as a load settles, does not rust and can be cut without the whipping hazard of steel. Steel strap offers higher tensile strength per unit of width and does not creep, which matters for rigid, dense loads such as coils, ingots and sawn timber. Choosing between them is a question of load behavior, not of which material is generically better.
This comparison sets out where each material performs, how to size a strap correctly, and what to verify before placing a container order.
Table of Contents
- What Each Strap Actually Does
- Material and Production Differences
- PET vs Steel: Side-by-Side Comparison
- Where PET Strapping Wins
- Where Steel Strapping Still Wins
- How to Size a Strap for a Load
- Cost Comparison: Per Meter and Per Pallet
- Common Buying Mistakes
- Quality Checks Before Shipment
- What to Include in an RFQ
- Frequently Asked Questions
- Source PET Strapping from Pefilmpack
What Each Strap Actually Does
A strap is a tension member. It holds a stack of cartons, a bundle of profiles or a coil together so the unit survives handling, stacking and a sea voyage. Two properties decide whether it works: break strength, the load the strap carries before failing, and elongation, how the strap responds as the load compresses or settles.
Steel is stiff. It takes high tension with very little stretch, so a rigid load stays rigid. PET stretches a few percent under tension and then tries to return to its original length, which keeps tension on a load that settles in transit. That difference explains most of the selection decisions buyers face.
Material and Production Differences
PET strapping band is made from polyester resin. The resin is dried, extruded into a flat band, then stretched in a longitudinal orientation step that aligns the polymer chains and builds tensile strength. The band may be embossed for grip or left smooth, then cooled, wound and tested for strength.
Steel strapping starts as cold-rolled strip, slit to width, heat treated to a target temper, and painted, waxed or galvanized to limit corrosion, then coiled and packed with edge protection.
The practical consequence is weight. PET delivers a given break strength at lower mass per meter, which reduces freight cost and operator fatigue. Steel delivers more strength per millimeter of width, which is why narrow, high-tension applications still favor it.
PET vs Steel: Side-by-Side Comparison
| Attribute | PET strapping band | Steel strapping |
|---|---|---|
| Base material | Polyester (PET) | Cold-rolled steel |
| Elongation at break | Higher, typically several percent with recovery | Low, generally a small fraction of PET |
| Tension retention | Good on settling loads; slight creep under sustained load | Excellent; no creep |
| Corrosion | Not affected by moisture | Rusts unless coated or galvanized |
| Weight per meter | Low | High |
| Cutting safety | Cut with a suitable tool; low recoil | Severe recoil hazard; requires face and hand protection |
| Load contact | Rounded edges, less damage to cartons | Sharp edges can cut cartons and printed surfaces |
| Joining method | Friction weld, seal or metal buckle | Metal seals, crimped |
| Recycling | Recyclable polymer stream | Scrap metal stream |
| Relative cost | Higher per kilogram, lower per meter of comparable strength | Lower per kilogram |
Read the table with care: “stronger” and “cheaper” both depend on width and thickness. A 15.5 mm PET band and a 12.7 mm steel band are not directly comparable until you match break strength. Ask suppliers for break strength per band and elongation at break, then compare cost per meter at equal strength.
Where PET Strapping Wins
Export pallets and containerized cargo
Humidity inside a container cycles with temperature. Steel rusts, and rust stains transfer to cartons and products. PET does not corrode, so it is the safer choice for long sea voyages and for loads where appearance matters on arrival.
Loads that settle in transit
Corrugated cartons, foam, textiles and bagged goods compress under vibration. PET’s elasticity keeps tension as the load settles, whereas a steel strap can go slack once the load shrinks. Fewer re-tensioning stops at destination is a direct labor saving.
Sites with manual handling
Cutting steel strap is one of the most common causes of hand and eye injuries in warehouses. PET cuts cleanly with a dedicated cutter and does not spring back violently, which reduces personal protective equipment dependence and incident risk.
Products sensitive to edge damage
PET band edges are rounded and the material is softer than steel. On printed cartons, furniture panels, insulation boards and paper products, PET causes noticeably less surface damage.
Where Steel Strapping Still Wins
Rigid, dense industrial loads
Steel coils, wire rod, ingots, plate and heavy machinery are strapped under very high tension. Steel holds that tension without creep, which PET cannot fully match over long storage periods.
Sharp-edged or abrasive loads
Where the load edge can cut, steel resists abrasion better and is less likely to be severed during handling. Edge protectors help both materials, but steel has more margin.
High-temperature conditions
Steel tolerates heat that would soften or degrade a polymer strap. Foundries, hot-rolling operations and kiln-dried timber still specify steel for this reason.
Very narrow strap positions
Where the strap path is narrow or the available tensioning tool is steel-only, steel remains the practical option.
How to Size a Strap for a Load
- Estimate the load’s demand. Take the weight the straps must retain, add the dynamic factor from lifting, braking and stacking, then divide by the strap count. A safety factor is applied on top.
- Select break strength. Choose a band whose stated break strength exceeds the calculated demand by a comfortable margin. Do not size only by width, because two bands of the same width can differ significantly in strength. Typical band formats and strengths are set out in this PET strapping band buyer’s guide.
- Match elongation to load behavior. Rigid loads suit low elongation; compressible loads benefit from a strap that recovers.
- Check the joint. A friction-welded PET joint achieves a high share of band strength when the tool and parameters are correct. A poor weld is the most common field failure.
- Protect the edges. Use corner boards or edge protectors wherever the strap crosses a corner, regardless of material.
Requirements may vary by application, market and applicable standard, so treat supplier data as a starting point and validate on your own loads.
Cost Comparison: Per Meter and Per Pallet
Steel is usually cheaper per kilogram. PET is lighter and often cheaper per meter at comparable break strength, and it removes rust-related claims and part of the injury risk. The only meaningful comparison is cost per secured pallet or coil.
Build the comparison from four numbers: strap consumed per unit, cost per meter at equal strength, labor time per unit, and damage or claim cost per 1,000 units. Sites that switch from steel to PET typically see lower weight shipped and fewer carton surface complaints; sites staying on steel are protecting a rigid load where tension retention dominates every other factor.
Freight belongs in the calculation. A container of PET carries more meters per kilogram, so landed cost per pallet can fall even when the invoice price per roll looks higher.
Common Buying Mistakes
- Comparing price per roll. Roll weights differ. Convert to cost per meter and per pallet.
- Ignoring elongation. A stronger strap that loses tension on a settling load fails at destination, not at the factory.
- Using the wrong tool. Steel tensioners and seals do not work on PET. PET needs a friction-weld or buckle system matched to the band.
- Over-tensioning compressible loads. Excessive tension crushes cartons and corners, and the strap then goes slack. Tension should suit the load, not the maximum the tool allows.
- Skipping the trial. Always test a sample band on a real load with the real tool before ordering a container.
- Assuming coating is optional. On steel, paint or galvanizing determines how the strap performs in humid conditions.
Quality Checks Before Shipment
For PET, verify width and thickness across the coil, break strength from batch records, color consistency, embossing pattern and coil tightness. Check that the band has no visible lateral cracks, which indicate over-stretching during production. Weld a few sample joints with the specified tool and pull them; joint efficiency is the figure that matters in service.
For steel, check width and thickness, temper, coating coverage and coil edge condition. Rust spots or edge nicks on delivery point to storage problems and will worsen at sea.
For both, confirm coil weight, core size, packing and shipping marks, and request the batch test record for the specific lot rather than a generic certificate. Tensile properties are commonly reported using methods such as ASTM D882 or ISO 527-3, but the applicable method should be agreed in writing.
What to Include in an RFQ
- Material and grade: PET or steel, and surface type (smooth or embossed, painted or galvanized).
- Width and thickness, with tolerance.
- Break strength target and elongation requirement.
- Color, and whether printing is required.
- Coil weight or length, and core inner diameter.
- Joint method: friction weld, seal or buckle.
- Tooling you already own, so the band matches it.
- Load description: weight, dimensions, edge condition, whether the load settles.
- Quantity in coils, pallets or containers, and trial order intention.
- Destination port and shipping terms.
Frequently Asked Questions
Is PET strapping as strong as steel?
Per millimeter of width, steel is usually stronger. Per kilogram, PET delivers more strength, which is why it replaces steel on many export loads once the band is sized to equal break strength.
Does PET strapping stretch over time?
It creeps slightly under sustained high tension, far less than polypropylene. On compressible loads its recovery is an advantage; on rigid loads held for years, steel is more stable.
Can I weld PET strap with a steel sealer?
No. PET requires a friction-weld tool, a heat seal system or a metal buckle. Steel seals on PET produce joints that fail well below band strength.
Will PET strap damage cartons?
Less than steel in most cases, because the edges are rounded and the material is softer. Corner protectors are still recommended on heavy loads.
What thickness of PET strap should I use for a 1,000 kg pallet?
It depends on strap count, load rigidity and dynamic factor. Send the load details and ask for a sizing calculation rather than choosing by thickness alone.
Can PET strap be recycled?
Yes, it belongs in the polymer recycling stream, though collection infrastructure varies by market.
Source PET Strapping from Pefilmpack
Weishan Litong Packing Material Co., Ltd. produces PET strapping band in smooth and embossed surfaces, with width, thickness, break strength, color and coil weight made to order. Strapping ships alongside PE stretch film, POF and PE shrink film, cling film, protective film, silage film, BOPP packing tape and automatic stretch wrapping machines, so mixed export packaging orders can travel together. Bands are strength-tested by batch, wound to the requested coil format and packed for sea freight, with OEM labeling available for distributors.
Send your specifications: material, width, thickness, break strength, color, coil weight, joint method, order quantity and destination port.
Recommended Images and Alt Text
| Image Placement | Image Description | Recommended File Name | Recommended Alt Text |
|---|---|---|---|
| Hero | PET strapping coils beside a steel strapping coil on a packing bench | pet-strapping-vs-steel-strapping-coils.jpg | Coils of green PET strapping band and steel strapping on a packing bench |
| Production | PET band extrusion and orientation line | pet-strapping-band-extrusion-line.jpg | Polyester strapping band running through an extrusion and orientation line |
| Detail | Close-up of embossed PET band surface and edge | embossed-pet-strapping-band-surface.jpg | Close-up of the embossed surface and rounded edge of a PET strapping band |
| Joint | Friction weld tool joining two PET band ends | pet-strapping-friction-weld-joint.jpg | Friction weld tool joining two ends of PET strapping band on a pallet |
| Application | Export pallet strapped with PET and corner protectors | pet-strapped-export-pallet-corners.jpg | Export carton pallet secured with PET strapping and corner protectors |
| Comparison | Steel coil strapped with steel band in a mill | steel-strapping-steel-coil-bundling.jpg | Steel coil bundled with steel strapping in an industrial plant |
| Packing | PET strapping coils packed in export cartons | pet-strapping-coils-export-cartons.jpg | PET strapping coils packed in cartons for export shipment |