Why must mountaineers keep ropes away from sharp rock edges?

Mountaineers must keep ropes away from sharp rock edges because contact with such surfaces can compromise the structural integrity of the rope. While nylon is used in mountain climbing for its strength and firmness, it remains susceptible to damage when subjected to the abrasive or cutting action of sharp rock.

Because a rope's primary function is to maintain tensile strength under load, any degradation—such as the fraying or severing of individual filaments caused by sharp edges—significantly reduces its ability to support weight safely. Ensuring the rope remains free from such hazards is a fundamental safety practice in mountaineering to prevent catastrophic failure during a climb.1