If during a road accident the protective helmet takes a violent blow, is it safe to continue using it?

Question

DentroTest · Accepted Answer

The protective helmet is designed to absorb the energy of a crash through the controlled deformation of its components, especially the inner expanded polystyrene (EPS) padding. This deformation is irreversible and occurs precisely so that the energy of the impact does not reach the head. Once this material has been compressed to cushion a strong blow, it loses its protective capacity against a second impact, even if the shell appears undamaged on the outside, so the helmet must be replaced immediately. That it depends on the manufacturing material is a mistake, because no material prevents internal structural fatigue. Continuing to use it as long as the shell shows no cracks is not safe either, because good outward appearance does not guarantee the integrity of the protection system.

If during a road accident the protective helmet takes a violent blow, is it safe to continue using it?

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