Low stretch value is a listed benefit of polyester slings.

• A. Low stretch value
• B. Magnetic properties
• C. High rigidity
• D. Heavy weight

Answer: (A)

Low stretch is a key advantage of polyester slings because it directly affects control and safety during lifts. When a sling elongates, the load can shift or surge as the crane begins to lift, making positioning more difficult and increasing dynamic forces. Polyester slings stretch relatively little under load, so the load stays more stable, moves less unexpectedly, and the rigging experiences smaller peaks in force. That stability is especially valuable for careful placement and reduces the risk of sudden load movement.

Magnetic properties aren’t a practical lifting advantage, and high rigidity isn’t typical for polyester slings—these slings are fairly flexible and that flexibility helps them wrap around and secure various shapes. Heavy weight would actually be a drawback for handling and maneuvering the sling. So the low stretch value best describes the listed benefit.