folding endurance

n. a measure of a material’s strength based on its ability to sustain folding until it breaks


With the onset of defined international preservation standards, folding endurance has been measured by the number of double folds [ISO 5626: Paper – Determination of folding endurance; TAPPI Test Method T 511: Folding endurance of paper (MIT tester); and TAPPI Test Method T 423: Folding endurance of paper (Schopper type tester)]. Before these standards, some nonstandardized techniques measured single folds.