Climbing ropes are typically of kernmantle construction, consisting of a core (kern) of long twisted fibres and an outer sheath (mantle) of woven coloured fibres. The core provides about 80% of the tensile strength, while the sheath is a durable layer that protects the core and gives the rope desirable handling characteristics.
Ropes used for climbing can be divided into two classes: dynamic ropes and static ropes. Dynamic ropes are designed to absorb the energy of a falling climber, and are usually used as Belaying ropes. When a climber falls, the rope stretches, reducing the maximum force experienced by the climber, his belayer, and his equipment. Static ropes stretch much less, and are usually used in anchoring systems. They are also used for abseiling (rappeling) and as fixed ropes to climb with ascenders.
Webbing is flat rope: it has no core. It is a versatile component of climbing equipment. Modern webbing is often made from dyneema, which is usually stronger and lighter than nylon,— while 12 mm dyneema slings have a tensile strength of around 22kN, a one-inch (25-mm) tubular climb-spec nylon webbing has a tensile strength of about 20 kN (4000 pounds)[1]. Webbing is usually tied (using a water knot or beer knot) or sewn into a loop and is then known as a runner or sling.
Runners have many uses, including anchor extension or equalisation, makeshift harnesses, carrying equipment and as a component of quickdraws.
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