Editor: Otto Tromm | Test date: 12-5-2026
Polypropylene braided rope without core is known as light, low-cost, and functional — but how does it actually perform under maximum load? The test results reveal a pattern that will surprise even experienced rope users.
In five standardised breaking strength tests, this 6mm polypropylene braided rope without core broke at an average of 4.09 kN (417 kg).
A braided construction without core — and yet virtually identical in breaking strength to the spiral braided variant of the same diameter. That makes this rope notably efficient for its category.
What is 6mm polypropylene braided rope without core?
This rope is manufactured from polypropylene (PP), one of the lightest synthetic fibres used in rope production. Polypropylene has a specific gravity below 1.0, meaning it floats on water. This is a practical advantage in marine and fishing applications.
The construction is braided without core. This means the rope consists of a braided sheath with no internal core or heart.
As a result, the rope is lighter and more flexible than a sheath-and-core rope, but lacks the additional tensile load contribution that a core would provide. The diameter is 6.0 mm.
Typical applications include:
- Temporary barriers and marking
- Packaging and bundling
- Agriculture and horticulture
- Lightweight lifting situations without safety-critical loads
- Marine auxiliary applications where buoyancy is required
How was the breaking strength of 6mm polypropylene rope measured?
Tests were carried out on a universal testing machine with rope-specific clamps. Five individual breaking strength tests were performed on separate lengths of rope from the same production batch.
The test speed was 20 mm/s, in accordance with the applicable standard for rope with a diameter below 12 mm (ISO 2307). No pre-load was applied. The rope was tensioned until failure occurred; the breaking strength was recorded as the maximum force at the point of failure.
All five tests resulted in immediate, clean breaks — no gradual failure patterns were observed. Test conditions were dry and at room temperature.
Breaking strength of 6mm polypropylene rope: test results
The average breaking strength across five tests was 4.09 kN (417 kg). The highest measured value was 4.13 kN, the lowest 4.04 kN. The spread between the highest and lowest values is only 0.09 kN — a notably tight break curve for a rope in this price range.
A notable behaviour was observed during testing: the rope exhibited significant elongation before breaking, followed by an extremely loud snap at the point of failure.
Also worth noting: the average breaking strength of 4.09 kN is virtually identical to that of another construction using the same material and diameter (SKU T-20201). Despite the absence of a core, the braided construction delivers a comparable breaking strength to the alternative construction type.
6mm polypropylene rope compared with other ropes
To place the test results in context, the measured breaking strengths of ropes with the same nominal diameter of 6 mm are listed below:
- Nylon sheath-and-core, core of 2 parallel strands: 6.75 kN
- Polypropylene 3-strand twisted: 6.58 kN
- PPMF (multifilament polypropylene): 5.30 kN
- Polypropylene braided without core (this rope): 4.09 kN
This rope scores the lowest of the compared 6mm ropes. Nylon sheath-and-core is 65% stronger (6.75 kN vs. 4.09 kN). Even polypropylene 3-strand twisted reaches 6.58 kN — 61% more than the braided variant without core. PPMF multifilament, also polypropylene, still offers 30% higher breaking strength at 5.30 kN.
The comparison with 3-strand twisted polypropylene is particularly notable: the same base material, the same diameter, but a fundamentally different construction yields 2.49 kN more breaking strength. The coreless braided construction therefore trades considerable strength for flexibility and ease of handling.
When to use 6mm polypropylene braided rope without core
This rope is best suited for lightweight, temporary, and non-safety-critical applications where weight and cost take priority over maximum breaking strength.
Specific situations where this rope performs well:
- Packaging and bundling: the braided construction sits comfortably in the hand and does not cut in during manual use
- Temporary barriers and marking: light, low-cost, easy to remove
- Floating lines: polypropylene floats; this rope is suitable as a floating line, pool boundary marker, or barrier line on water
- Agriculture and horticulture: best suited for training plants, supporting and tying crops under light loads
- General outdoor use in short-duration applications: UV resistance is limited, but in short-term use this is rarely a factor
Applying a safety factor of 5:1 (standard for general lifting applications), this rope yields a working load of approximately 83 kg (0.82 kN). For life-safety applications (factor 10:1), the working load drops to approximately 42 kg.
When is polypropylene rope not suitable?
Polypropylene braided without core is not suitable in the following situations:
- Prolonged UV exposure: polypropylene has the lowest UV resistance of all synthetic fibres. In structural outdoor use, the rope degrades significantly in strength without visual warning
- Safety-critical applications: with an MBL of 4.09 kN and a coreless construction, this rope is not intended for life-saving or personal safety applications
- High shock loads: the rope exhibits significant elongation and a loud snap at break point — overloading is accompanied by a hazardous energy release
- Applications where abrasion resistance is a priority: without a core, the braided sheath is the sole structural component; surface wear directly reduces load-bearing capacity
- Prolonged static load at elevated temperatures: polypropylene exhibits creep under sustained load, particularly at temperatures above 60°C
- Where a breaking strength above 4.09 kN is required: select an alternative rope — see below
Alternatives to 6mm polypropylene braided without core
Where higher breaking strength or better durability is required in the same diameter, the most relevant alternatives are:
- Polyester braided 6mm white per metre — polyester offers significantly higher UV resistance, minimal water absorption (<1% strength loss when wet), and better abrasion resistance; suitable for long-term outdoor and marine applications
- Nylon braided (polyamide) (6mm, spool 100 metres) — nylon reaches 6.75 kN at 6mm diameter and has the highest elongation of synthetic fibres (20–35%), making it ideal for shock-absorbing applications such as anchor lines and tow ropes; note: nylon loses 10–15% strength when wet
Conclusion
6mm polypropylene braided rope without core is best suited for light, temporary, and non-safety-critical applications where weight, ease of handling, and cost are the deciding factors, and where a breaking strength of 4.09 kN (417 kg) is sufficient. Where prolonged outdoor exposure, high abrasion, or safety loads are expected, polyester or nylon in the same diameter is the more appropriate choice.
View this rope here
This test was carried out by Otto Tromm, who after the fifth loud snap concluded that polypropylene without core may score modestly on breaking strength, but is absolutely unbeatable in dramatic effect.
Test data collected by Prorope. This text was generated using AI on the basis of that data and checked for factual accuracy. Read how we test and publish →