(1) Impact absorption performance: According to the prescribed method, conduct impact testing after high-temperature, low-temperature, immersion, and irradiation pretreatment, and the force transmitted to the head mold shall not exceed 4900N; The cap shell must not have any fragments falling off.
(2) Puncture resistance: Conduct puncture testing after high-temperature, low-temperature, immersion, and irradiation pretreatment according to the prescribed method, with the steel cone not in contact with the surface of the head mold; The cap shell must not have any fragments falling off.
(3) The strength of the chin strap: When tested according to the prescribed method, the force value when the chin strap breaks should be between 150-250N.
