Goodrich Flexometer (HBU and blow-out) ISO 4666-3

Cyclic compression of rubber causes heat to develop in the material, which may eventually result in complete internal degradation of the rubber. This test, which is normally performed at 30 Hz, a 1 MPa static load followed by a dynamic stroke of 4.45 mm, measures the temperature rise, creep and permanent deformation of a rubber material under dynamic load during and after the test. This is called the Heat Build-Up (HBU) test. If the static load is raised to 2 MPa, the test is known as a blow-out test (BO).


The test is carried out according to ISO standard 4666-3 unless otherwise desired.


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