What is the standard weight for helmets?

[AmirFitz]

Helmet weight standards: Small-brim and rolled-edge safety helmets should not exceed 430g (excluding accessories). Large-brim safety helmets should not exceed 460g (excluding accessories). Cold-proof helmets should not exceed 690g (excluding accessories). Performance requirements: The shell should be hemispherical, sturdy, smooth, and have a certain elasticity, capable of absorbing the impact and puncture energy from striking objects. There should be a certain space between the shell and the inner lining to cushion and disperse instantaneous impact forces, thereby avoiding or reducing direct harm to the head. Impact absorption performance, puncture resistance, lateral rigidity, electrical insulation, and flame retardancy are the basic technical requirements for safety helmets. Usage precautions: Some foam cushioning materials in helmets have very low density, even less than the foam padding used for packaging household appliances, and can be easily broken by hand—these are substandard. Some inner lining materials feel very uncomfortable, so careful selection is advised.