Technical parameters of industrial and hobby ropes
| Parameters | PP split film | PP Multitex | POLYS | Polyamide | Polyester |
| strength | here | here | here | here | here |
| min. relative strength | 4.23 cN/dtex | 6.62 cN/dtex | 6.62 cN/dtex | 7.06 cN/dtex | 7.06 cN/dtex |
| 4.8 g/den | 7.5 g/den | 7.5 g/den | 8.0 g/den | 8.0 g/den | |
| density | 0,91 g/cm3 | 0,91 g/cm3 | 0,91 g/cm3 | 1.14 g/cm3 | 1.4 g/cm3 |
| floating | yes | yes | yes | no | no |
| softening temperature | 140°C | 140°C | 150°C | 170°C | 225°C |
| maximum application temperature | 100°C | 100°C | 100°C | 80°C - 100°C | 180°C |
| working temperature (of environment) | to 80°C | to 80°C | to 75°C | to 100°C | to 120°C |
| UV resistance | good* | very good* | very good* | good | excellent |
| acid resistance | +++ | +++ | +++ | + | ++ |
| alkaline resistance | +++ | +++ | +++ | ++ | ++ |
| resitance to organic solvents | ++ | ++ | ++ | ++ | +++ |
Notes:
| +++ | excellent resistance |
| ++ | suitable resistance |
| + | limited resistance |
Rope strength:
Rope strength is an important basic characteristic and is measured in N (Newtons) at the point of rupture. Strength can also be measures in kN and daN (kilo-Newtons and deca-Newtons… 1kg = 0,981 daN). Maximum strength is in accordance with accepted European norms:
- EN ISO 1346 - PP pásek a PP Multitex
- EN ISO 14687 - Polysteel
- EN ISO 1140 - Polyamid
- EN ISO 1141 - Polyester
- EN ISO 14686 - Polyester/polyolefin dvojitá vlákna
The maximum strength of non-standard ropes is determined on the basis of our own laboratory measurements, and testing equipment certified and controlled by Germanischer Lloyd.
Relative strength:
Represents the overall strength (in Newtons, formerly in grams) of a rope under tension based on the material type of rope - split film, fibre, monofilament (measured in dtex, formerly in deniers) This allows for individual materials to be compared to one another.
Comparison of relative strengths of ropes made of different materials, based on:
Nosnost lan:
It is important to differentiate between the maximal breaking strength of a rope, and its working load. Working load is the absolute maximum strain that can be put on a rope. This is based on a given safety coefficient. When working with a modified rope, to lift a load for example, we have to respect the rope's given safety factor, which will in turn give us the rope's working load.
For example: a load-lifting rope with a minimal strength of 1 000kg and a safety factor of 5:1, has a working load of 200kg.
Factors influencing rope strength:
- rope construction
- rope abrasion - scratched surface fibres can lead to decreasing strength
chemicals - the strength of ropes made from materials that are not resistant to certain chemicals can be significantly affected - store your ropes away from all chemicals! - heat - See the Table of Characteristics - store ropes away from heat sources!
- sun (UV radiation) - store the ropes out of contact with the sun!
- shock load
- braiding - reduces rope strength by about 10%, braiding must be done very carefully
- knots - reduce rope strength around 50% (up to 90% in steel ropes)
Abrasion resistance:
This is important for the strength of the rope, and for judging the condition of the rope during use. It shows how resistant a given rope is to the abrasion caused by sharp edges.
Material abrasion resistance test:
Melting temperature:
This is one of the basic physical characteristics of synthetic materials. Under the influence of heat, synthetic materials can undergo irreversible changes (surface fabric can start to glaze). It is important to keep in mind that rope should not be stored near sources of heat, because it could lead to changes in the underlying strength of the rope.
Maximum long-term-use temperature:
Refers to the temperature which, over the long term, doesn't damage the product, but which could lead to changes in key technical parameters.
UV radiation resistance:
UV radiation causes textile materials to lose strength. Synthetic and natural materials vary in their resistance to UV radiation, or sunlight. Some materials, especially polyolefins, require UV stabilisation.
According to applicable norms, PP rope stabilised at 100kLy should lose no more than 50% of its strength after being exposed for a year to 100kLy of UV intensity.
Stabilisation can negatively affect rope strength. Our POLYS SunFix are protected even under very high intensities of sunlight. PP multifilament fibre ropes are very resistant to UV radiation.
