How about the service life of the safety helmet?
Note the use of helmets: (1) to have a chin strap and cap hoop and tied firmly to prevent slipping and knocked off the hat; (2) thermoplastic safety cap can be washed with water, not hot water soaking, not baked in the radiator, the stove, to prevent the cap body deformation; (3) the use of helmets exceeds the specified limit, or a serious impact, although invisible crack, it should be replaced. General plastic safety helmet use for a period of three years; (3) wear a safety helmet before, should check the parts are damaged, the assembly is firm, whether the locking cap lining adjustment part, whether the rope fastened, sure all parts intact before use.
Helmet protection: 1) to prevent object injury; (2) to prevent falling head injury; (3) to prevent mechanical damage; (4) prevent pollution hair damage.
From the manufacturing finish date, the branch preparation cap shall not exceed 2 years. The plastic paper rubber cap shall not exceed 2.5 years. The GRP cap shall not exceed 3.5 years
