This Upper and Vamp Material Flexing Tester is used to determine the propensity for materials to crack or otherwise fail at flexing creases, but can also be used to assess whether leathers are likely to produce salt spue.
Leather grain tester, Grain Crack Index Tester, Sole Leather Grain Crack Index Tester: To determine the propensity of the grain of a leather to crack during bending. The method is applicable to all sole leathers.
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