If we have samples at home, we can easily test
them against each other (splice loops in both,
interlace loops, apply tension until one fails.
If not at the splice, the broken cord is the weaker.)
If we have no samples, we might as well ask
someone who sells rope.
You left out way too much information for anyone to give an
What type of construction?
Do you need tensile strength, shear strength? some elasticity? No
What will it be used for?
Is UV exposure and issue?
That's for starters.
Nylon, given same size and construction. Polypropylene is (IMO) a lousy
rope material...only nice thing about it is that it floats.
The strongest rope materials are nylon and Dacron (polyethylene). Use nylon
if you want stretch (dock lines), Dacron if you don't (sheets).
Actually strongest rope materials are Kevlar aramid and Spectra gel spun
polyethylene. Nylon and Dacron have about the same tensile strength.
Polypropylene is generally weaker. Choice would depend on end use.
Under what conditions? Sun exposure, tight bends, exposure to
sharp surfaces, lots of flexing vs none, what gauge stands and how are
the strands braded?
Take some of each and try it out in your application.
The real problem with poly rope is the sun will tear it up pretty
fast. In Florida I wouldn't expect it to last a year outside before it
degraded to the point that it was 50% strength.
YMMV in more moderate UV exposure
I put a black Nylon rope on my 24' extension ladder
some years ago. I keep it on top of the van and the
rope is as good as new. I see so many ropes on
extension ladders disintegrate when pulled and most
of them are white polypropylene.
Nylon is much stronger. There was a story about a tugboat that would
pull too hard and break the rope and keep their end. When they tried
this on a nylon rope it nearly slingshoted them back to the vessel that
tossed them the rope.
Hemp also rots, either rope or smoker's brain.
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