This section provides technical information about the features of our ropes. Read each section to see the features that apply to some or all of our dynamic ropes and to determine which features work best for your application.
|It allows escape if the sheath has been cut.||It allows temporary cutting of rope lengths with a knife, without melting the ends, without fraying of the sheath.|
|It prevents sheath slippage.||It reduces shrinkage in water by more than 50 %.|
Kernmantle construction is the standard in Life Safety dynamic climbing ropes. This means that the sheath (mantle) and the core (kern) of the rope are made independently of one another, so that the sheath provides abrasion protection of the core strands, which provides the tensile strength of the rope.
Sheath braid design is a fine balance between yarn denier, tension, number of carriers (bobbins), and amount of yarn used.
The number of yarn bundles used in making the sheath of a rope help determine the hand, or feel, of the rope. More bundles result in a softer and (but thinner sheath) while fewer bundles contribute to toughness and durability. Most PMI Dynamic™ ropes have either 32, 40, or 48-bundles in
the sheath. During the manufacturing process, bundles are woven into the rope by “carriers”, thus we would say that these are 32, 40, or 48-carrier ropes, respectively.
PMI strives to find the perfect balance for each of our ropes. Many customers prefer the feel and knotability of a 48-carrier rope, so we accommodate this by making this our design of choice for most ropes. Exceptions include our 8.1 mm Verglas and 10.6 mm Wall Rope, which is made as a 32-carrier rope for maximum durability. Also, our skinny 8.9 mm Erratic and 9.4 mm Elite ropes which are made with a 40-carrier construction for your peace of mind in that moment of truth.
More carriers = softer hand
Fewer carriers = more abrasion resistance
THE PERFECT ROPE, therefore, is ALWAYS a compromise!!
All PMI Dynamic™ rope sheaths are specially treated to increase resistance to wear resulting from abrasion, falls, dirt, and water; which significantly increases the usable life of your rope.
PMI sheath yarn is treated with an extraordinary chemical process that
envelops each filament with a durable, resistant coating. The fiber is then heat-treated, creating an actual shield of polymerized molecules within the yarn. This shield is then secured in place by chemical bonding with the molecules of the polyamide...resulting in a durable, resistant, protected yarn which we then use to create PMI Dynamic™ ropes.
You don't have to ask for it because every PMI rope is made with the same superior sheath yarns.
In our quest to engineer the ultimate dry rope, we have gone above and beyond the core! UltraDry™ dynamic ropes have BOTH the core strands AND the sheath yarns dry treated. PMI UltraDry™ ropes will actually float for hours – really! Every filament of yarn for these ropes undergoes a process to create an actual shield of polymerized molecules within the yarn. This shield is then secured in place . . . resulting in a durable, resistant, protected yarn which is made into PMI UltraDry™ ropes. Not all dynamic ropes use UltraDry™ Technology, so check the label first.
Every PMI rope has a middle mark so you can find the middle of the rope with ease. If the black mark wears, you can easily mark the center again using only the PMI Tec marker. To prevent damage to your rope, only use approved methods to mark your rope.
This is the DNA of your rope and is what sets our ropes apart from others that don’t go through certification processes to ensure maximum safety and quality. The name, date, and place where the rope was made is printed on ID Tape that is woven into the core of the entire length of the rope. You should always climb on a rope with ID Tape so if you question its reliability you at least have some traceable information about that rope. You can cut the end of your rope to find the ID Tape in the core of PMI ropes. This important feature meets CI (Cordage Institute) 1801 requirements.