folding endurance

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

Notes

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.