CAMP
Sling Express Ring Dyneema 240CM

Dyneema® is the trade name for high modulus polyethylene (HMPE). It is special material with many practical benefits for climbing and rigging. First, it has a much lower density than standard polyamide (nylon) with a specific gravity of 0.97 versus 1.14. So it weighs less, but can still be used to perform most of the same functions for safety and rigging as nylon. Se cond, HMPE fibers actually have a much higher tensile strength than polyamide so less material is needed to achieve equal strengths to nylon webbing. This allows full-strength Dyneema® slings to be thinner than nylon slings in addition to lighter. Other benefits of HMPE are that it does not absorb water and has greater resistance to degradation from chemicals and UV light. These are properties specifically worth considering vis-à-vis specific environmental conditions and climbing styles. Ice and alpine climbers, for instance, are well-served by Dyneema® because the slings will not soak up water or ice up in wet conditions. Rock climbers can realize huge weight and bulk savings by using Dyneema® runners. Although Dyneema® has many great properties, it also has a few draw backs. HMPE is slick and has a low melting point so it is not recommended for friction hitches, such as the Prusik or Klemheist. The material will slide against itself too easily or melt in the event of a large fall. Dyneema® also has very little stretch while nylon webbing is dynamic so it can actually help reduce the impact of a fall. This can become an important consideration in systems that otherwise lack components designed for the absorption and dissipation of dynamic force. But the reality for climbers is that the rope and friction from anchor points take the brunt of the force, so used in conjunction with a good dynamic rope and proper protection, Dyneema® runners are a prime choice. Nylon, conversely, is best suited for shorter slings like the dogbones on quickdraws where it can help to decrease the force of a fall and usually maintains enough width and surface area to hold biners in place and offer something to grab when working projects. Nylon runners are also the right choice for variable length loops requiring knots of any kind .