Weathering Trials and New Rigidity Tests on Protective Helmets for Motor Cyclists

摘要

Protective helmets with fiberglass or polycarbonate shells were exposed to the weather for three years and subjected to conventional and new rigidity tests. These indicated that: (1) Exposure did not cause deterioration in performance. (2) There was a serious imbalance between the rigidity of the shell and the hardness of the liner. (3) Some current Standards encourage selection of a grade of shock absorbing liner that is too hard relative to the rigidity of the shell.