How to test the resistance of a polymeric material to cut growth during repeated flexing.

1.Scope :This method is used to test the resistance of a polymeric material to cut growth during repeated flexing.

To speed up the test it is normally conducted at a temperature at which the resistance of the material to cut growth is low. But the temperature may not necessarily be a temperature the material is wanted to experience in normal wear.

This method is used for most types of flexible material, particularly those used in footwear solings but not leather. But the method may be suitable for testing leather board, crepe rubber or  the combinations of dual-density material.

2.Principle: Rectangular specimens of the material are cut from a sheet or a moulded sole. Sometimes the samples may be particularly moulded for the test.

A narrow cut is performed through the full thickness of the specimen in the centre of its width. Next, the specimen is repeatedly flexed around the cut position at 90 degrees until the length of the cut has increased to a expected length, or a fixed number of flexes has been reached.

The rate of arithmetic mean cut growth per 1000 flexing cycles is then calculated. The thickness of the specimen is vital to the results . So a standard thickness must be used.

The test may be conducted in the same way if the material is thinner than the standard thickness.

But the result obtained for the cut growth rate may be lower than for a specimen of a standard thickness.

If required, the test specimens may be worked with special treatments before testing.

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More details please refer to 

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