The EN 397 standard specifies physical and performance requirements, methods of test and marking requirements for industrial safety helmets. Industrial safety helmets are intended primarily to provide protection to the wearer against falling objects and consequential brain injury and skull fracture. The main characteristics that distinguish these protective devices are: the capability of absorbing blows, puncture resistance, resistance to rain and sunlight, resistance to chemical agents and flammability, dielectric properties.
The requirements are as follows:
Impact resistance: force transmitted to the head &#;5.0 kN with impact energy 49 J (a mass of 5 kg falling from a height of 1 metre).
Penetration resistance: no penetration with impact energy 29 J (a mass of 3 kg falling from a height of 1 metre).
Flame resistance: no damage after exposure to the flame for 5 seconds;
Resistance to low temperature (-20 °C or -30 °C): impact and penetration resistance at a temperature of -20 °C or -30 °C. Optional requirement.
Resistance to high temperature (+150 °C): impact and penetration resistance at a temperature of 150 °C (optional requirement).
Electrical properties (440 V AC): leakage current &#;1.2 mA at a voltage of 1,200 V AC (optional requirement).
Lateral deformation (LD) &#;40 mm and residual deformation &#;15 mm, when subject to a progressive load up to 430 N. Optional requirement.
Molten metal splashes (MM): no damage after contact with 150 g of molten iron (optional requirement).
Industrial safety helmets from uvex comply with standard DIN EN 397, which states that they must be designed to protect the wearer from falling objects. Protection against mechanical impacts to the head safeguards the user against possible consequences such as brain injuries or skull fractures. The standard also includes protection against lateral deformation of the helmet, as well as protecting the wearer from dangerous head injuries.
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Industrial safety helmets that comply with standard DIN EN 397 generally meet the following safety requirements:
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Binding requirements optional requirements All helmets certified according to EN 397 must meet these requirements. A helmet certified in accordance with EN 397 may meet these requirements; they are, however, not mandatory requirements. shock absorption, vertical very low temperatures (-20&#;°C or -30&#;°C) penetration resistance (against sharp and pointed objects) very high temperatures (+150&#;°C) flame resistance electrical insulation (440 V) chin strap attachment: chin strap releases at minimum 150N and maximum 250 N molten metal (MM) lateral deformation