PET Strapping Grades Explained: Choosing the Right Width, Thickness & Break Strength

Industry Data: PET strapping performance is governed by a small set of measurable parameters — width, thickness, break strength, elongation, embossing and core — yet mis-specifying any one of them is a leading cause of both strap failure and unnecessary packaging cost, making grade selection a high-leverage decision. Source: Strapping specification and packaging engineering guidance.

PET (polyester) strapping looks simple, but choosing the right grade is where most strapping decisions succeed or fail. Width, thickness, break strength, embossing and core size each change how the strap performs on your load and in your machine — and getting any one wrong means breakage or wasted money. Greenstrix (greenstrix.com) manufactures 19 PET grades up to 1,400 Kgf, and this guide explains exactly how to choose the right one.

1. The Five Parameters That Define PET Grade

PET strapping is not one product but a range of grades, each defined by five measurable parameters. Width and thickness set the cross-section; break strength is the resulting holding power; embossing (the textured surface) affects sealing; and core size must fit your equipment.

Getting the grade right means matching all five to your specific load and machine — not just picking a break-strength number. Greenstrix manufactures 19 PET grades across this parameter space, so the right combination is available for each application.

2. Width & Thickness: The Strength Drivers

Width and thickness are the primary strength drivers. A wider, thicker strap has a larger cross-section and therefore higher break strength, suiting heavier loads; a narrower, thinner strap suits lighter loads at lower cost. Common PET widths range from about 9 mm for light bundling up to 19 mm and beyond for heavy securing.

The two work together: the same break strength can come from different width-thickness combinations, and the best choice depends on the load shape and machine. Greenstrix offers PET across the full width and thickness range, reaching up to 1,400 Kgf break strength.

• 9–12 mm — light bundling, cartons, light pallets.
• 12–16 mm — medium loads, general palletising.
• 16–19 mm+ — heavy loads, high-tension securing.
• Thickness — increased for higher tension and break strength.

3. Break Strength: Matching to the Load

Break strength is the headline number, but it must be matched correctly. The strap must hold the tension and dynamic forces of the load and journey, so its rated break strength should exceed the required holding force with a safety margin — typically the strap is chosen well above the static load to allow for transit forces.

Under-rating causes breakage; over-rating wastes money on strap stronger than needed. Greenstrix offers PET from light grades up to 1,400 Kgf, so the grade can be matched precisely to each load with an appropriate margin. See the strapping breakage guide linked below for failure diagnosis.

4. Embossing, Elongation & Machine Compatibility

Beyond raw strength, two properties matter for performance. Embossing — the textured surface — improves the friction weld in automatic and battery tools, giving stronger, more reliable seals. Controlled elongation lets the strap stretch slightly under load and recover, absorbing shock and retaining tension as loads settle.

For machines, consistency is critical: stable width and thickness, proper embossing, and the correct core ID (commonly 406 mm) for reliable feed without jams. Greenstrix manufactures embossed, machine-grade PET to tight consistency. See the strapping machine strap guide linked below for machine matching.

5. Core Size, Coil & Packaging Formats

The core and coil format are practical but important. The core inner diameter must fit the machine spindle or dispenser — 406 mm is common for automatic machines, with smaller cores for hand and battery tools. A mismatched core simply will not run.

Coil size (weight and length) affects how often operators change coils and how the strap handles. Larger machine coils reduce changeovers on high-volume lines; smaller coils suit hand tools. Greenstrix supplies PET in machine and hand-grade coil formats with the correct cores for your equipment.

• 406 mm core — common for automatic machines.
• Smaller cores — hand and battery tools.
• Large coils — fewer changeovers, high-volume lines.
• Correct format — keeps the line running efficiently.

6. Choosing Your PET Grade: A Practical Method

Bringing it together: start with the load — its weight, shape and the transit forces — to determine the required holding force, then add a safety margin to set the target break strength. Choose a width and thickness that reach that strength, select embossed machine-grade strap if using machines, and match the core to your equipment.

This method avoids both breakage (under-specifying) and wasted cost (over-specifying). Greenstrix offers 19 PET grades up to 1,400 Kgf and advises the right one for your load and machine, with samples and datasheets. See the buy-PET-bulk and supplier-selection guides linked below.

1. Determine load weight & holding force.
2. Add safety margin → target break strength.
3. Pick width/thickness to reach it.
4. Choose embossed machine-grade + correct core.

7. People Also Ask

Is thicker PET strapping always better?

No — thicker strap gives higher break strength but costs more and may be unnecessary for lighter loads. Match the grade to the load with a safety margin rather than over-specifying. Greenstrix offers 19 PET grades so you can match precisely.

What is the strongest PET strapping available?

Greenstrix PET strapping reaches up to 1,400 Kgf break strength across its heaviest grades, suitable for heavy industrial and export loads. For even heavier securing, composite cord strap up to 2,680 Kgf is used.

Does PET strapping width affect machine compatibility?

Yes — the machine must be set for the strap width, and the core must fit the spindle. Using the width and core the machine expects, in embossed machine-grade, ensures reliable feed. Greenstrix supplies machine-grade PET in matching formats.

How much safety margin should PET strapping have?

The strap's rated break strength should exceed the load's required holding force with a margin for transit forces — strap is typically chosen well above the static load. Greenstrix can advise the right grade and margin for your load.

8. Frequently Asked Questions

Q: What defines a PET strapping grade?

Five parameters: width, thickness, break strength, embossing (surface texture) and core size. Together they determine holding power, machine compatibility and cost. Choosing a grade means matching all five to your load and equipment, not just picking a break-strength number. Greenstrix offers 19 PET grades across these parameters up to 1,400 Kgf.

Q: How do width and thickness affect PET strapping?

They are the primary strength drivers — a wider, thicker strap has a larger cross-section and higher break strength for heavier loads, while narrower, thinner strap suits lighter loads at lower cost. Common widths run from about 9 mm to 19 mm and above. Greenstrix offers PET across the full width and thickness range.

Q: How do I match PET break strength to my load?

Determine the load's required holding force including transit forces, then choose a grade with rated break strength above it plus a safety margin — under-rating causes breakage, over-rating wastes cost. Greenstrix offers PET from light grades up to 1,400 Kgf to match precisely with the right margin.

Q: Why does PET strapping need embossing?

The embossed textured surface improves the friction weld in automatic and battery tools, producing stronger, more reliable seals than smooth strap. Combined with consistent dimensions and the right core, it ensures reliable machine performance. Greenstrix supplies embossed, machine-grade PET.

Q: What core size do I need for PET strapping?

The core inner diameter must match your machine spindle or dispenser — 406 mm is common for automatic machines, with smaller cores for hand and battery tools. A mismatched core will not run. Greenstrix supplies PET in machine and hand-grade coil formats with the correct cores.

Q: How many PET grades does Greenstrix offer?

Greenstrix manufactures 19 PET strapping variants spanning widths, thicknesses and break strengths up to 1,400 Kgf, in embossed machine-grade and hand-grade formats, so the right grade is available for any load and machine. Greenstrix advises the right grade with samples and datasheets.

9. Related Guides & Products

• PET Strapping Band Europe
• Buy PET Strapping Bulk Europe
• Strapping Machine Strap Guide
• Why Strapping Keeps Breaking
• PET vs PP vs Cord Strap Comparison
• Composite Cord Strap vs Steel
• How to Choose a Packaging Supplier
• Reduce Packaging Costs Europe 2026
• EN 12195 Cargo Securing Guide
• PET Strapping
• PP Strapping
• Composite Cord Strap
• Stretch Film
• PET Strapping — Germany
• PET Strapping — France
• PET Strapping — Italy
• PET Strapping — Poland
• PET Strapping — UK
• PET Strapping — Spain
• Manufacturing Industry
• Metals Industry
• Logistics Industry
• All Products
• Certifications
• Why Greenstrix