1, size requirements

The size requirements of the helmet are: internal dimensions of the shell, caps, brims, vertical spacing, horizontal spacing, wearing height, protrusions, and vents.

Among them, the vertical spacing and wearing height are two important dimensions of the helmet.
The vertical distance refers to the axial distance between the highest point of the head and the inner surface of the cap when the helmet is worn (excluding the space of the top bar).
The size requirement is 25 mm to 50 mm.
Wearing height refers to the axial distance from the bottom edge of the helmet cap to the highest point of the head when the helmet is worn.
The size requirement is 80 mm to 90 mm.
The vertical spacing is too small and will directly affect the stability of the helmet. Any failure of either of these two requirements will directly affect the overall safety of the helmet.

2, weight requirements

Under the premise of ensuring safety performance, the lighter the weight of the helmet is, the better the fatigue of the neck caused by the long-time wearing of the operator can be reduced.
The weight of the small, medium and volume safety helmets should not exceed 430 grams;
The weight of a large helmet should not exceed 460 grams;
The weight of the cold-proof helmet should not exceed 690 grams (the above weight requirements do not include additional parts).

3, safety performance requirements

Safety performance refers to the protective performance of the helmet, including basic performance requirements and special performance requirements. It is an important indicator to determine whether the helmet product is qualified or not.
The safety helmet standard GB2811-1989 clearly stipulates the requirements that helmet products should meet.
These performance requirements are the criteria that must be met by the product, whether producers, users or marketers should use this as a basis to determine whether the helmet can be shipped, sold, and used.
Product Qualification Standards The state implements industrial production license management and safety identification management on safety helmets.
The GB2811-89 "Hard Hat" standard is a mandatory standard.
Hard hat products must be reviewed and approved by the competent department. They must have production equipment, tooling equipment, necessary environmental conditions and facilities, product inspection equipment, quality management personnel, inspectors, technicians, and production personnel. The ability, quality management and control capabilities, and factory inspection capabilities.
Each batch of products produced by a company must pass the sampling inspection before it can leave the factory.
Companies should add labels and categories containing the following information to their products:
One product name and category;
Second company name, address;
Three manufacturing years and months;
Four factory certificate;
Five production license marks and numbered marks;

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