Polyester slings should not be used in temperatures over _____.

• A. 194 degrees
• B. 212 degrees
• C. 180 degrees
• D. 164 degrees

Answer: (A)

Polyester slings have a finite heat resistance; exposure to high temperatures weakens the fibers and can lead to sling failure. The maximum safe operating temperature for polyester slings is about 194 degrees Fahrenheit (90°C). Exceeding this limit reduces strength and the sling’s rated capacity, especially under dynamic loading. That’s why the correct limit is 194 degrees. The other numbers either represent temperatures above or below the actual safe maximum and don’t reflect the established limit.