One should be carried out to check whether the helmet documents have a complete. Each helmet should have a certificate of conformity, 兒童頭盔, the use of instructions. Among them, the certificate of conformity should reflect the enterprise product design name, model, production activity date, batch number, implementation of national standards, test analysis results, production equipment manufacturers and manufacturers address and other information.
Second, check whether the quality is up to standard. When the head is hit, the main material of the helmet EPS can absorb or shunt the impact through extrusion deformation or cracking, so that the head from the fatal impact, to protect our safety. If the helmet does not use EPS, there is no safety.
Poor quality helmets imitate the appearance of EPS, the use of a situation similar to the foam board material, particles false, low foam density, the fundamental problem can not effectively resist the impact force, the purchase can be hand pinch a pinch, the regular EPS material has a hard, naked eye for basic information can not be seen a deformation.
Third, focus on the key links. As for the shell, although the helmet shell materials are ABS materials, some factories use recycled materials. Recycled material, as the name suggests, is recycled other ABS plastic, re-injected into the hat shell, the use of recycled hat shell, the strength and performance of the box will be reduced, the safety will also be greatly reduced; For the lens, most electric bike riders will buy a large lens (also known as a large mask) helmet, the helmet can prevent the winter wind chill, summer rain and mosquitoes. In the choice should also pay attention to the clarity of the lens, if the lens is not clear enough, it will affect the sight of the bike, thus causing safety hazards. At the same time, consumers in the purchase of helmets equipped with lenses, be sure to check the hardness of the lens, clarity, whether the UV resistance.
The fourth is to choose the right size. Brand helmets will have different sizes, each size corresponds to the size of the corresponding head circumference. Wear the helmet, no head pain, and adjust both sides of the webbing and buckle, fasten the chin buckle, shake the head, the helmet does not shake, indicating that the helmet size is more appropriate.