Fatal head injury No Motorcycle helmet The first impact on the surface is the second impact between the head and skull. The first impact occurred when the motorcycle helmet hit an obstacle, and the second impact occurred when the brain hit the skull. The head tissue may be crushed or torn, causing permanent damage. Cerebral hemorrhage will increase the pressure on the skull and crush the brain tissue! During frontal impact, the impact force will directly penetrate the bottom of the skull, and the strong impact force will cut the spine and skull, cutting off the breathing and heartbeat functions.
Now you know the importance of motorcycle helmets?
Because the fatal head injury is not the first time to hit the motorcycle helmet surface, but the second time between the head and skull. Therefore, the purpose of motorcycle helmet is to reduce the speed of head hitting skull. The industry standard is measured by G value. The main certification rule test of motorcycle helmet test is to place sensors in the motorcycle helmet, let the motorcycle helmet fall from different heights, angles and test methods and hit sharp metal, and then test how much force the inner layer of motorcycle helmet bears when the motorcycle helmet encounters obstacles and stops moving rapidly.
In addition to the free fall test, there is also a penetration test to see whether sharp objects can penetrate the motorcycle helmet; At the same time, there are also fall off test, deformation test and bonding test, aiming at whether the motorcycle helmet is easy to fall off, whether the motorcycle helmet is deformed, and whether the bonding is deformed.
SNELL: the standard detection value is 300g. Generally, the head of a healthy adult can withstand an impact of 400G to 600G.
Ministry of Transport: The large impact force cannot reach 400g, which is time limited. The impact above 200g shall not exceed 2ms, and the impact above 150g shall not exceed 4ms.
Sharp: In addition to frontal collision, Sharp pays more attention to bilateral cheek collision, such as rotating collision, which is closer to the possible accidents on the actual street.
How to buy motorcycle helmets?
The shell shall be made of hard and durable materials, which can absorb more impact energy. The buffer layer shall be made of non-toxic and harmless materials, which can absorb more collision energy and cover the head protection area. The inner liner is made of sweat absorbing and breathable materials; The goggles shall be made of materials that meet the light transmittance and impact force, and the light transmittance shall not be less than 85%.
The weight of motorcycle helmet shall not exceed 1.6 kg for full top motorcycle helmet and 1.3 kg for half top motorcycle helmet. The left and right horizontal field of vision is not less than 105, and the upper field of vision is not less than 7.
Motorcycle helmets must have fixed identifications, such as product name, manufacturer name and address, trademark, product type, product model and specification, production date, product batch number or serial number, etc.
Motorcycle helmets must be selected according to their head circumference, large (580 mm - 600 mm) and medium (560 mm - 580 mm).
Stop wearing helmets after the motorcycle has a major collision.
When purchasing a motorcycle helmet, you should also use your left hand and right hand to pull the two sides of the motorcycle helmet respectively, and then rub your head from left to right upward. But when picking up, on the contrary, you should try to shake the motorcycle helmet back and forth after wearing it to see if the size is appropriate. Tightness shall not be squeezed or shaken. You can't weigh a motorcycle helmet by hand. The correct way is to wear it on your head, if your neck doesn't feel heavy.
Seeing here, my dear friends, you must remember that you can't drive without a motorcycle helmet.
