crack or otherwise fail at flexing creases, butcan also be
used to assess whether leathers are likely toproduce salt
spue. In particular, the test simulates conditionsin the
vamp part of footwear during walking. The testcan be
conducted with either wet or dry specimens atroom
temperature. The method is applicable to allflexible
materials and in particular those used tomanufacture
outers and linings of footwear uppers such asleathers,
coated fabrics and textiles.
A square specimen of the material is folded overtwo inverted V-shaped clamps. The clamps are able to move relative to one another so that as they becomecloser the specimen is flexed to produce one downward crease surrounded by four upward creases. During the test, theclamps oscillate at a constant speed sothat the specimen is repeatedly flexed. After a predetermined number of cycles,the test is stopped and the specimen isvisually examined for signs of damage or salt square.