This standard provides performance and testing requirements for industrial helmets, commonly known as hard hats. It establishes the types and classes of protective helmets, depending on the type of hazard encountered. It includes specifications for helmets designed to offer protection from lateral impact, or top-only impact, giving employers and users the flexibility to specify the helmet that best meets the needs of their specific workplace.

Industrial head protective helmets meeting the requirements of this standard are classified as Type 1 for top protection, or Type 2 for lateral impact protection. 

• Type 1: top-head protection, excels against vertical blows, limited lateral defense.
• Type 2: versatile head protection, guards against side, top impacts effectively.

Both types are tested for impact attenuation and penetration resistance. Type 2 helmet performance requirements include criteria for impact energy attenuation from impacts from the front, back and sides as well as the top; off-center penetration resistance, and chin strap retention.

The three classes indicate the helmets electrical insulation rating:

• Class G: endures 2,200 volts, reliable defense in electrical environments, shock protection.
• Class E: withstands 20,000 volts, shields against arcs, electrical shocks assured.
• Class C: general head protection, lacks electrical resistance, no arc flash defense.