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Significance and Use
4.1 The folding endurance is frequently used to estimate the ability of the paper and plastics film to withstand repeated bending, folding, and creasing.
4.2 Folding endurance has also been found useful in measuring the deterioration of paper and plastics film upon aging.
1.1 This test method describes the use of the M.I.T.-type folding apparatus for determining folding endurance of paper and plastics film. The M.I.T. 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. The procedure for the Schopper-type apparatus is given in Test Method .
1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered standard
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D585 Practice for Sampling and Accepting a Single Lot of Paper, Paperboard, Fiberboard, and Related Product
D643 Test Method for Folding Endurance of Paper by the Schopper Tester
D685 Practice for Conditioning Paper and Paper Products for Testing
D1968 Terminology Relating to Paper and Paper Products
E122 Practice for Calculating Sample Size to Estimate, With Specified Precision, the Average for a Characteristic of a Lot or Process
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ASTM D2176-16, Standard Test Method for Folding Endurance of Paper and Plastics Film by the M.I.T. Tester, ASTM International, West Conshohocken, PA, 2016, www.astm.orgBack to Top