Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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tearing resistance ( tearing strength )

1. The force required to tear a specimen of paper under specified controlled conditions. In archival work, the two most important measures of tearing resistance are: 1) internal (or continuing) tearing resistance, where the edge of the sheet is cut before the actual tear is made, and 2) edge tearing resistance, i.e., the resistance offered by the sheet to the onset of tearing at the edge, and which appears to be dependent on both the extensibility and the tensile strength of the paper.

The Library Binding Institute specifications for library binding call for endpapers (60 pound basis weight, 24 X 36�) to have a tearing resistance with the machine direction of the paper of 140 pounds per one-inch strip and 160 pounds in the cross direction; the test being conducted on the Elmendorf tester. 2. The force in pounds required to tear a specimen of leather at a place where the specimen is cut before the actual tear. (17 , 62 , 209 , 363 )

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