The four basics types test required by International Standards
are the shock absorbtion, rigidity, deformation of the retention system, and the rotation stability.
• The "shock absorbion test" determines the capacity of an helmet
to absorb and dissipate the energy of a blow.
• During the test the deceleration of a helmet gauged headform falling free onto an anvil
at given speed is measured.
• The "rigidity test" measures the maximal and residual deformation of a helmet
submitted ti lateral or longitudinal compression.
• The "retention system test" mesures the maximal and residual elongation
of the chinstrap of a helmet submitted to dynamic stress at a given energy.
The stability measures the roll-of angle of a helmet submitted to a dynamic rotational face.