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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