Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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folding endurance

The number of folds which a specimen (usually paper) will withstand before failure, under controlled conditions in a specified instrument. In the usual test, a specimen is subjected repeatedly to double folds through a wide angle while under tension.

Folding endurance is a very important indication of the durability of archival papers. The test is usually conducted in an environmental room. A decline in folding endurance is the most sensitive indicator of aging and deterioration of paper. (17 , 62 )

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