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Polyester strapping (usually called PET strapping) is a high-strength plastic strapping made from polyester used to secure pallet loads, unitize cartons, and strap heavy shipments—especially loads that settle, compress, or get abused in transit.
In plain English: polyester strapping is the “modern workhorse” strap that replaced steel in a lot of industrial applications because it’s strong, safer, and holds tension better on loads that move and compress.
If you strap pallets for a living, PET is the strap you’ll see everywhere for a reason.
Let’s break down what polyester strapping is, what it’s used for, why people choose it over PP or steel, and how to know if it’s right for your loads.
What polyester strapping is (one clean definition)
Polyester strapping is a high-tensile, flexible plastic strap used for medium-to-heavy-duty load securement, known for strong retained tension and shock absorption.
That’s the magic phrase: retained tension.
Because in the real world, loads don’t stay perfectly rigid.
They settle.
They compress.
They vibrate.
And weak straps loosen.
PET holds better when the load changes.
What polyester strapping is used for
PET is used for:
1) Pallet load securement
Keeping stacked cartons, cases, or products from shifting on a pallet.
2) Bagged products that settle
Think:
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pellets
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powders
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resins
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feed
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cement-style bags (industry-dependent)
Those loads compress, which makes straps loosen—PET handles that better than many alternatives.
3) Heavy cartons and industrial shipments
When loads are too heavy for light-duty strapping.
4) Replacing steel strapping (in many cases)
For loads where steel used to be default, PET is often chosen now because it’s safer and still strong.
5) Unitizing bundles
Building materials, mixed pallet loads, and other industrial shipments.
Why polyester strapping is popular (the real benefits)
âś… Strong tensile strength
PET can handle serious load tension compared to basic polypropylene strapping.
âś… Better retained tension on settling loads
If your load compresses, PET keeps “pulling back” better so the strap doesn’t go slack as easily.
âś… Shock absorption
During transit (vibration, braking, turns), PET absorbs shock better than rigid materials, reducing snap failures.
âś… Safer than steel
Steel can recoil and cut. PET is safer to handle in most operations.
âś… Less damage risk (when used with protectors)
With edge protectors and good practices, PET can be strong without chewing up cartons like steel can.
Polyester (PET) strapping vs polypropylene (PP) strapping
PP strapping
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best for light duty
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cheaper
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more stretch/less strength
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more likely to loosen on heavy or settling loads
PET strapping
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medium to heavy duty
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stronger
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better retained tension
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better for pallets and industrial shipping
If PP is the “starter strap,” PET is the “professional strap.”
Polyester strapping vs steel strapping
Steel strapping
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max strength
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minimal stretch
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best for very rigid, sharp, or high-heat loads
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higher safety risk and can damage product
PET strapping
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very strong for many applications
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better on settling loads
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safer and easier to handle
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won’t rust
Steel still has a place. But PET is often the smarter strap for most palletized freight.
How polyester strapping is applied (manual vs machine)
PET can be applied using:
Manual tools
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tensioner + sealer systems
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buckles (in some setups)
Good for lower volume or field strapping.
Battery-powered tools
Fast and common for warehouses strapping pallets.
Automatic strapping systems
High volume operations often run PET through machines for repeatability.
Your application method matters because it affects:
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tension level
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seal quality
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consistency
The most common polyester strapping mistakes
❌ 1) No edge protection
Strap tension crushes cartons.
Use edge protectors / corner protectors / strapping protectors.
❌ 2) Using PET on razor-sharp edges without protection
Sharp edges can cut straps. Steel or better protection may be required.
❌ 3) Under-tensioning or poor seals
A strong strap with a weak seal is still a weak system.
❌ 4) Trying to strap a bad pallet build
If the stack is crooked, strap just locks the crookedness in place.
Polyester strapping works best as part of a securement system
If you want fewer claims, combine PET strapping with:
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edge protectors / corner protectors
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layer pads (chipboard, corrugated, honeycomb)
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stretch wrap for containment
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good pallet pattern
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blocking/bracing/dunnage when trailer voids exist
Strapping is securement. Wrap is containment. Pads are protection.
Bottom line
Polyester strapping (PET) is a high-strength plastic strap used to secure pallets and heavy loads, especially loads that settle or compress. It’s popular because it’s strong, holds tension well over time, absorbs shock in transit, and is safer than steel for many applications.