1. Size Requirements
The size requirements of a helmet include internal dimensions of the shell, cap, brim, vertical spacing, horizontal spacing, wearing height, protrusions, and vents. These dimensions are essential to ensure a proper fit and optimal protection for the user.
Among these, vertical spacing and wearing height are two critical measurements. Vertical spacing is defined as the axial distance between the highest point of the head and the inner surface of the helmet cap when worn (excluding the space occupied by the top bar). This measurement should be between 25 mm and 50 mm. Wearing height refers to the distance from the bottom edge of the helmet cap to the highest point of the head when the helmet is properly worn. The recommended range for this is 80 mm to 90 mm.
If the vertical spacing is too small, it can compromise the helmet's stability, increasing the risk of it shifting or falling off during use. Similarly, an improper wearing height may affect the overall fit and reduce the effectiveness of the helmet in protecting the head. Any failure in meeting these specifications could significantly impact the safety of the user.
2. Weight Requirements
Under the condition that the helmet maintains its safety performance, a lighter weight is always preferable. A lighter helmet reduces neck fatigue, especially for workers who wear it for extended periods. This contributes to better comfort and, ultimately, improved safety on the job.
The maximum weight for small, medium, and large safety helmets should not exceed 430 grams. For cold-weather helmets, the weight limit is slightly higher at 690 grams. These limits do not include any additional components such as visors, ear protectors, or other attachments. Manufacturers must carefully balance weight with structural integrity to meet both comfort and safety standards.
3. Safety Performance Requirements
Safety performance refers to the protective capabilities of a helmet, encompassing both basic and special performance requirements. These criteria are crucial in determining whether a helmet meets quality and safety standards.
The Chinese national standard GB2811-1989 sets clear guidelines for helmet products. It outlines the necessary performance requirements that all helmets must fulfill before they can be approved for use. This standard serves as a reference for manufacturers, users, and retailers to ensure that only safe and reliable helmets reach the market.
In addition to the standard, safety helmets are subject to industrial production license management and safety identification systems. The GB2811-89 "Hard Hat" standard is a mandatory regulation that all hard hats must comply with. Before being released for sale, each batch of helmets must undergo sampling inspections to confirm compliance.
Manufacturers are required to label their products with key information, including the product name, company details, manufacturing date, factory certificate, and production license marks. These labels help ensure transparency and traceability, allowing users to verify the authenticity and quality of the helmet they are purchasing.
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