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Application
This 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. In particular the test simulates conditions in the
vamp part of footwear during walking. The test can be
conducted with either wet or dry specimens at room
temperature. The method is applicable to all flexible
materials and in particular those used to manufacture
outers and linings of footwear uppers such as leathers,
coated fabrics and textiles.
Principle
A square specimen of the material is folded over two inverted V-shaped clamps. The clamps are able to
move relative to one another so that as they become closer the specimen is flexed to produce one
downward crease surrounded by four upward creases. During the test the clamps oscillate at a constant
speed so that the specimen is repeatedly flexed. After a predetermined number of cycles the test is stopped
and the specimen is visually examined for signs of damage or salt sque.