For the safety of climbers, UIAA stipulates that the ductility of the power rope should be less than 8%, otherwise the climbing rope will be turned into a bungee rope, causing climbers to bump up and down on the rock wall, which is very dangerous. There is also a type called static rope. The ductility of this type of rope is less than 1%, or it is regarded as a rope with zero ductility in an ideal state. This type of rope is generally used for the following purposes: cave exploration, mountaineering Road rope, and industrial use, etc. It should be pointed out here that static ropes are generally white in color, and the price is 1/3 cheaper than climbing ropes, but they must never be used for climbing. The experimental results show that after an 80Kg object is dropped 0.6m and pulled by a rope statically, the impact force of the rope on the object is far greater than 12 kN, which is disastrous for climbers.
When we can choose a climbing rope, the user does not need to care about the maximum static tension of the rope. This parameter has no practical meaning. Professional climbing ropes require extremely strict technical parameters. For example, the size of the double inner core of the outer net of each meter of rope is strictly specified as 1.5~2cm according to different ropes.
Finally, a supplementary note is that the rope with a diameter of 10mm or more is called the main rope, and the word UIAA① is marked on the rope end. This kind of rope can be used alone in areas that are not too steep in mountaineering. When using double ropes in steep conditions, Each rope can be individually hung into the protection point to bear the impact force.