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CAT NO: DIDACTICNLE-Export-610001
Crackness Tester For Testing Lab Workshop.
Crackness Tester - For Testing Lab
The resistance to cracking of the grain of a leather sample and its
crack index are determined by taking a rectangular strip from the sample
of leather under test and bending it around a cylindrical mandrel while
maintaining the two in close contact. The test specimen is successively
bent over mandrels of diminishing diameters to produce successively
higher degree of extension in its outer grains till cracks start
appearing on its outer surface. The diameter of mandrel over which the
crack is first observed gives the measure of the resistance to cracking
and crack index of the sample under test.
The Crackness Tester
consists of an arrangement to hold the test specimen at one of its
ends, a roller to bend it over the mandrel while keeping it pressed
against it, a lever pivoted at the axis of the mandrels, and a set of
mandrels of specified diameters with an arrangement to fix them over a
fixed pin
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