scope:

A specimen is mounted by clamping one end in the upper clamp of the flexing machine with the grain surface folded inwards so that the surfaces touch and the fold line is horizontal, then the loose end is turned inside out and bent 90° before being inserted in the lower clamp. In the lower clamp the specimen is held inside surface to inside surface and the fold line is vertical. Oscillation of the upper clamp during the test causes the point of transition from inward to outward fold to run up and down the specimen. The method is based on ASTM D6182 and ISO 5402 (Note 1).