How to Perform a DFT

• A "double-fold" test (dft) is less subjective than a flex test.

• To test: select the outside corner of any page other than the title page, bend a small portion of it down toward you then press the fold between your fingers.

• Unfold the corner and bend it back in the opposite direction away from you then press the fold again.

• Straighten out the fold and pull out gently on the corner.

• You have now performed one "double fold".

Counting the Double Folds

• If the corner detaches during the first pull, the dft is one; if the corner separated from the page without (or before) the pull, the dft is zero.

• Continue double-folding the corner selected counting each double-fold until the corner detaches or five double fold attempts are completed.

• If the corner is still attached after five double folds, the book is not considered brittle.

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TABLE OF CONTENTS Brittle Books Program Operations and Procedures Manual
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For more information or reference assistance contact the Brittle Books Program at brittle@mail.uflib.ufl.edu.

Last Revised: 1996 December 3