To prevent these strength losses, snap hooks should be used to attach the safety rope to the worker and the structure. Snap hooks that are meant for animal confinement should not be used unless they have been approved for fall protection use. Also avoid snap hooks that are not self-locking, that is, where the keeper is held only by a spring. Twisting a hook that is not self-locking around a ladder rung or rope, for example, can open the keeper, allowing the hook to come free. Synthetic materials such as polypropylene, polyester, and nylon should be used for safety ropes.
Synthetic materials offer some cushioning when they stop a fall, reducing the chance for an injury.
Wire rope should be used if hot work, such as welding, is to be done, even though it offers reduced cushioning. Remember that wire rope should not be used near electrical wires. Safety ropes should be stored carefully. Sunlight, moisture, and many chemicals greatly reduce the rope's strength. Safety specialists recommend that safety ropes be replaced every 7 years, even if they do not appear to be damaged.