Standard Test Method for Folding Endurance of Paper and Plastics Film by the MIT Tester
The folding endurance is frequently used to estimate the ability of the paper and plastics film to withstand repeated bending, folding, and creasing.
Folding endurance has also been found useful in measuring the deterioration of paper and plastics film upon aging.
This test method describes the use of the M.I.T.-type folding apparatus (also known as MIT Tester) for determining folding endurance of paper and plastics film. The MIT tester can be adjusted for samples of any thickness; however, if the outer layers thicker than about 0.25 mm (0.01 in.) rupture during the first few folds, the test loses its significance.