Throwbag rope caracteristics
See what kind of throwbag ropes You find on the market. If you already have one: check which category it fits in and get to know a bit more about.
Coreless Polypropylene Rope
Strength 8mm:cca. 4kN
Abrasion test (see it here): destroyed in 3 sec.
Core: no core
general comment: sorrily there are plenty of thowbag ropes without core on the market. Producers have lower production costs but does not mean you pay less. Your rope will be extremely weak and non durable. the advantage is: light and small. My advice is: Try to avoid these!
Shock absorbing high stretch Polypropylene ropes
Strength 8mm: cca 5-7 kN
Abrasion test (see it here): destroyed in 3-8 sec
Cover: Polypropylene, stretchy braiding
Core: Polypropylene, stretchy braiding
Stretch: extremely high
general comment: the idea behind the stretch is to avoid the "big pull" when catching a swimmer. To use mechanical advantage or simply pull some pinned material is almost impossible. My experience is that even rescuing swimmers makes it a "Catapult". After absorbing the energy it gives it back. i personally would never use again, they are like bungee ropes.
(double braided and kernmantle)
Strength 8mm: cca 8kN
Abrasion test (see it here): 5-10 sec.
Stretch: relative low
general comment: good ropes on the market, compared to the ones before, these are worth to buy.
Syntec and Spectra ropes (including dyneema)
Strength 8mm: cca. 16 kN (the most)
Stretch: relative low
Abrasion test (see it here): 10 sec
general comments:expensive double priced ropes. If You have the money buy it! Still the biggest damage on ropes is caused by abrasion, so it gets damaged easily just like the other ropes. It does not give you a longer life or better resistance against abrasion, just a higher tensile strength.
Strength 8mm: 10kN (knotted 7kN)
Abrasion test (see it here): 60 sec+
general comment: more durable and resistant rope on an affordable price, though it gets damaged just like all. The advantage is that after a surface damage it will hold until you finish your rescue as the core is extremely durable. The Polyester brings the heat away from the abrasion zone. New generation of WWTC ropes coming May 2019 with even better abrasion resistance.