What Break Force Does PP Strapping Typically Offer?

The Break Force Question

When buyers specify PP strapping (polypropylene strapping) for a packaging line, the conversation almost always turns to strength: how much load can this strap hold? The answer lies in break force—the maximum tensile force the strap can withstand before breaking.

Unlike steel strapping, which is manufactured in rigid, high-strength grades, PP strapping is produced across a broad spectrum of break forces. This flexibility allows packaging engineers to match strap strength precisely to load weight, equipment capability, and cost targets. However, it also means that choosing the wrong specification can lead to either load failure or unnecessary material costs.

At Jushuo Packaging, our production data shows that break force optimization is one of the most effective ways to balance load security with packaging expenses. This guide explains the typical break force ranges available for PP strapping, how width and thickness influence strength, and how to select the right specification for your application.

1. Standard Break Force Ranges

1.1 The Typical Spectrum

According to industry specifications, PP strapping generally offers break forces between 45kg and 230kg. This range is segmented into common grades to serve different load categories.

1.2 How Break Force Is Determined

Break force is not a single material property; it is the result of two physical factors: the strap's cross-sectional area and its molecular orientation.

• Cross-sectional area: Determined by the strap's width and thickness. A wider or thicker strap contains more material to resist breaking.

• Molecular orientation: Achieved during the cold-drawing process. According to polymer science, stretching the polypropylene aligns molecular chains, significantly increasing tensile strength compared to unoriented material.

1.3 The Difference Between Break Force and Tensile Strength

It is important to distinguish between break force and tensile strength. Tensile strength is a material property measured in force per unit area (e.g., MPa or N/mm²). Break force is the total force the finished strap can withstand, usually measured in kilograms or pounds.

According to material data, polypropylene resin used in strapping achieves tensile strengths around 100–150 MPa. When formed into a strap of specific dimensions, this translates to the break force ranges shown above.

2. How Width and Thickness Affect Strength

2.1 Width and Break Force

For any given thickness, increasing the width increases the break force proportionally. Wider straps distribute the load over a larger surface area, which also reduces the risk of the strap cutting into the package.

2.2 Thickness and Break Force

For a fixed width, increasing the thickness increases break force. Thicker straps provide more material to resist tension, but they also require compatible sealing equipment and may have lower elongation.

At Jushuo Packaging, our lab data confirms that precise control over width and thickness yields consistent break force values across production batches.

2.3 Combined Effects on Strength

The interplay between width and thickness means there is no single "strongest" PP strap. Instead, there are optimized combinations. A 15mm x 0.65mm strap may provide better load distribution than a 19mm x 0.45mm strap, depending on the package shape and equipment constraints.

3. Selecting the Right Break Force

3.1 Load Weight and Safety Factors

According to packaging safety standards, strapping should be rated well above the static weight of the load. A common rule of thumb is to apply a safety factor of at least 1.5x for static loads and 2x for dynamic or shifting loads.

Example calculation:

• Load weight: 80kg

• Dynamic load factor: 2x

• Required break force: 160kg minimum

3.2 Number of Straps

For heavier loads, using multiple straps is often more effective than using a single ultra-thick strap. Multiple straps distribute the tension and provide redundancy if one strap is damaged.

• Light loads: 2 straps

• Medium loads: 3-4 straps

• Heavy loads: 4-6 straps

3.3 Equipment Compatibility

According to equipment manufacturers, automatic strapping machines are calibrated for specific break force ranges. Using a strap with a break force that is too low may result in frequent jams; using one that is too high may exceed the machine's tensioning capacity and damage the equipment.

4. Typical Applications by Break Force

4.1 Light-Duty Applications (45–85kg)

Ideal for carton closure, light bundling, and e-commerce packaging where the weight is manageable and the primary goal is secure containment.

4.2 Medium-Duty Applications (85–130kg)

Suitable for standard palletizing, bundling heavier cartons, and general industrial packaging.

4.3 Heavy-Duty Applications (130–180kg)

Used for heavier pallet loads, construction materials, and industrial packaging where load stability is critical.

4.4 Extra Heavy-Duty Applications (180–230kg)

Designed for heavy pallets, dense materials, and demanding applications where maximum PP strap strength is required.

Summary

PP strapping typically offers break forces ranging from 45kg to 230kg. This spectrum covers everything from light carton sealing to heavy-duty pallet bundling. Break force is determined by the strap's width, thickness, and the molecular orientation achieved during manufacturing.

For buyers, the key is to match the break force to the actual load requirements, applying appropriate safety factors and considering the number of straps used. While higher break force offers more strength, it also requires compatible equipment and may increase material costs.

Jushuo Packaging stands as your trusted polypropylene PP strapping manufacturer, delivering superior quality plastic strapping solutions backed by over a decade of specialized expertise. Our state-of-the-art 15,000㎡ manufacturing facility utilizes advanced Italian screen changers and precision cold-drawing technology to produce high-performance PP strapping with 99% pass rates. With annual production capacity exceeding 20,000 tons, we ensure reliable supply chains and competitive pricing for bulk orders. If you need assistance selecting the right break force for your PP strapping application, please send an email to sales@jushuopackaging.com, and our professional team will provide one-on-one support.

References

1. European Committee for Standardization. "EN 13394:2001 – Packaging – Strapping – Specifications for Polypropylene Strapping." CEN.eu, 2001.

2. ASTM International. "ASTM D3950 – Standard Specification for Strapping, Flat Steel and Seals." ASTM.org, 2021.

3. Signode Industrial Group. "Dylastic Polypropylene Strapping – Technical Specifications." Signode.com, 2025.

4. International Organization for Standardization. "ISO 9001:2015 – Quality Management Systems – Requirements." ISO.org, 2015.