According to safety regulations, polypropylene web slings should not be used at temperatures exceeding what limit?

Polypropylene web slings have specific temperature limitations that are crucial for their safe use. The correct answer indicates that these slings should not be used at temperatures exceeding 200 degrees Fahrenheit. At temperatures above this threshold, the structural integrity of the polypropylene fibers can be compromised, leading to a significant reduction in their strength and load-bearing capabilities. This is essential knowledge for ensuring safety in rigging operations, as using a sling that has been weakened by high temperatures can result in equipment failure and accidents.

In contrast, the other temperature limits provided in the choices either refer to far lower temperature thresholds or do not accurately reflect the safety guidelines associated with polypropylene web slings. Understanding these temperature limitations is vital for all rigging personnel to prevent potential hazards and maintain safe working conditions.