The Circular Bend Test determines fabric stiffness by measuring the amount of force that is required to push a fabric sample through a round hole. Testing is conducted on a steel platform with a 1.5” diameter hole in the center and uses a plunger to push the fabric through the opening.

This test is not a requirement of NFPA but is the optimal testing method to compare fabric stiffness. Less weight/force equals more flexibility.

Why is it Important to Consider Circular Bend When Purchasing Turnout Gear? Traditional gear can make it difficult to maneuver. While fighting a fire, you should feel comfortable and have a wide range of motion.