Do you know the basics about safety helmets?

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What is a safety helmet? A safety helmet is a protective device used to prevent impact objects from injuring the head. It consists of a cap shell, a cap lining, a lower cheek strap, and a rear band. The shell is hemispherical in shape, sturdy, smooth, and somewhat elastic; it is the shell that primarily bears the impact and penetrating kinetic energy from the striking object. There is a certain amount of space between the helmet shell and the lining, which helps to absorb and distribute sudden impacts, thereby preventing or reducing direct damage to the head. Impact absorption, puncture resistance, lateral stiffness, electrical insulation, and flame retardancy are the basic technical requirements for safety helmets. Classification of safety helmets: Safety helmet products are classified into two main categories based on their intended use: safety helmets for general operations (Category Y) and safety helmets for special operations (Category T). Category T is further divided into five subcategories; Category T1 is suitable for workplaces where there are sources of fire ； Class T2 is suitable for use in underground environments, tunnels, underground constructions, logging operations, and other similar settings ； Class T3 is suitable for flammable and explosive workplaces ； Class T4 (insulated) is suitable for live working areas ； The T4 (low temperature) category is suitable for low-temperature working environments. Each type of safety helmet has specific technical performance parameters and applicable ranges; therefore, the appropriate product should be chosen based on the industry and working environment in which it will be used. Consumers can choose the appropriate variety according to their needs. Safety helmets should be selected based on the industry and working environment in use. For example, the construction industry generally uses Type Y safety helmets ； In the power industry, due to exposure to electrical grids and electrical equipment, T4 (insulation) class safety helmets should be used ； When working in flammable and explosive environments, T3 safety helmets should be selected. The choice of color for safety helmets is quite flexible; generally, light colors or colors that are easy to spot are preferred, such as white or light yellow. It is also possible to choose colors in accordance with relevant regulations, following the principles of safety psychology, or based on departmental distinctions as well as the working environment. Structural functions of a safety helmet: Helmet shell – absorbs impacts and prevents falling objects from contacting the body. Brim: Keeps the safety helmet in a fixed position on the head. Top band: Distributes impact forces and maintains the floating of the helmet shell in order to distribute those forces. Rear clamp: The locking mechanism of the headband. Chin strap: Helps to maintain the condition and position of the safety helmet. Sweat-absorbing strip: Absorbs sweat. Buffer pad: Reduces the impact force when a shock occurs. Vertical spacing: reflects the gap between the inside of the helmet shell and the top of the head. If it is too small, ventilation is poor; if it is too large, the center of gravity of the helmet shell rises, causing the safety helmet to be unstable on the head. Horizontal spacing: Provides a buffer area when lateral forces are present due to impact. It also serves as a heat dissipation channel.