2, blue helmets, wearing this color hat is a technician or a special type of work.
3. The red hat represents two kinds of people: one is the security inspector; If the words "China Architecture" are printed on the side of the hat, it will be inspected by superior leaders and foreign guests.
4, white helmet, this color hat represents the management of the whole project.
Extended information: (1) Buffer and shock absorption: there is a gap of 25~50mm between the cap shell and the cap lining. When an object hits the helmet, the helmet shell will not be directly affected by stress and deformation.
(2) dispersed stress: the cap shell is oval or hemispherical with smooth surface, so when the object falls on the cap shell, it can't stay, but immediately slides down; In addition, the force borne by the impact point of the cap shell is transmitted to the surroundings.
(3) Biomechanics: It is stipulated in the standard that the helmet must be able to absorb 4 900N N. This is because in biological tests, the human cervical vertebra will exceed the maximum limit when stressed, and the cervical vertebra will be injured, which may lead to paralysis or life-threatening.
Reference: Baidu Encyclopedia-Safety helmet